Method for preparing antibodies having improved properties

ABSTRACT

The present invention is directed to methods and compositions for the production of Fc-containing polypeptides having improved properties and comprising mutations at positions 243 and 264 of the Fc region.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a division of U.S. application Ser. No. 13/699,213, filed Nov. 20, 2012, now pending, which claims the benefit of the National Stage of International Application No. PCT/US11/37826, filed on May 25, 2011, which claims the benefit under 35 U.S.C. 119(e) of U.S. Provisional Application No. 61/348,968, filed May 27, 2010, now expired.

REFERENCE TO SEQUENCE LISTING SUBMITTED ELECTRONICALLY

The sequence listing of the present application is submitted electronically via EFS-Web as an ASCII formatted sequence listing with a file name “GFI MIS 00003 US DIV 2 SEQLIST.TXT”, creation date of Oct. 30, 2015, and a size of 41 KB. This sequence listing submitted via EFS-Web is part of the specification and is herein incorporated by reference in its entirety.

FIELD OF THE INVENTION

The present invention is directed to methods and compositions for the production of glycosylated proteins (glycoproteins) and, specifically, Fc-containing polypeptides which are useful as human or animal therapeutic agents.

BACKGROUND OF THE INVENTION

Monoclonal antibodies often achieve their therapeutic benefit through two binding events. First, the variable domain of the antibody binds a specific protein on a target cell, for example, CD20 on the surface of cancer cells. This is followed by recruitment of effector cells such as natural killer (NK) cells that bind to the constant region (Fc) of the antibody and destroy cells to which the antibody is bound. This process, known as antibody-dependent cell cytotoxicity (ADCC), depends on a specific N-glycosylation event at Asn 297 in the Fc domain of the heavy chain of IgG1s, Rothman et al., Mol. Immunol. 26: 1113-1123 (1989). Antibodies that lack this N-glycosylation structure still bind antigen but cannot mediate ADCC, apparently as a result of reduced affinity of the Fc domain of the antibody for the Fc Receptor FcγRIIIa on the surface of NK cells.

The presence of N-glycosylation not only plays a role in the effector function of an antibody, the particular composition of the N-linked oligosaccharide is also important for its end function. The lack of fucose or the presence of bisecting N-acetyl glucosamine has been positively correlated with the potency of the ADCC, Rothman (1989), Umana et al., Nat. Biotech. 17: 176-180 (1999), Shields et al., J. Biol. Chem. 277: 26733-26740 (2002), and Shinkawa et al., J. Biol. Chem. 278: 3466-3473 (2003). There is also evidence that sialylation in the Fc region is positively correlated with the anti-inflammatory properties of intravenous immunoglobulin (IVIG). See, e.g., Kaneko et al., Science, 313: 670-673, 2006; Nimmerjahn and Ravetch., J. Exp. Med., 204: 11-15, 2007.

Given the utility of specific N-glycosylation in the function and potency of antibodies, a method for modifying the composition of N-linked oligosaccharides and modifying the effector function of antibodies would be desirable.

Yeast and other fungal hosts are important production platforms for the generation of recombinant proteins. Yeasts are eukaryotes and, therefore, share common evolutionary processes with higher eukaryotes, including many of the post-translational modifications that occur in the secretory pathway. Recent advances in glycoengineering have resulted in cell lines of the yeast strain Pichia pastoris with genetically modified glycosylation pathways that allow them to carry out a sequence of enzymatic reactions, which mimic the process of glycosylation in humans. See, for example, U.S. Pat. Nos. 7,029,872, 7,326,681 and 7,449,308 that describe methods for producing a recombinant glycoprotein in a lower eukaryote host cell that are substantially identical to their human counterparts. Human-like sialylated bi-antennary complex N-linked glycans like those produced in Pichia pastoris from the aforesaid methods have demonstrated utility for the production of therapeutic glycoproteins. Thus, a method for further modifying or improving the production of antibodies in yeasts such as Pichia pastoris would be desirable.

SUMMARY OF THE INVENTION

The invention relates to an Fc-containing polypeptide comprising mutations at amino acid positions 243 and 264 of the Fc region, wherein the mutations at positions 243 are selected from the group consisting of: F243A, F243G, F243S, F243T, F243V, F243L, F243I, F243D, F243Y, F243E, F243R, F243W and F243K and the mutations at position 264 are selected from the group consisting of: V264A, V264G, V264S, V264T, V264D, V264E, V264K, V264W, V264H, V264P, V264N, V264Q and V264L, wherein the numbering is according to the EU index as in Kabat. In another embodiment, the Fc-containing polypeptide comprises mutations F243A and V264A. In another embodiment, the Fc-containing polypeptide comprises mutations F243Y and V264G. In another embodiment, the Fc-containing polypeptide comprises mutations F243T and V264G. In another embodiment, the Fc-containing polypeptide comprises mutations F243L and V264A. In another embodiment, the Fc-containing polypeptide comprises mutations F243L and V264N. In another embodiment, the Fc-containing polypeptide comprises mutations F243V and V264G. In one embodiment, the Fc-containing polypeptide of the invention is an antibody or an antibody fragment. In one embodiment, the Fc-containing polypeptide of the invention is an antibody fragment comprising SEQ ID NO:18. In another embodiment, the Fc-containing polypeptide of the invention is an antibody fragment comprising SEQ ID NO:19. In another embodiment, the Fc-containing polypeptide of the invention is an antibody fragment consisting (or consisting essentially of) SEQ ID NO:18 or SEQ ID NO:19.

In one embodiment, the Fc-containing polypeptide is an antibody comprising the heavy chain amino acid sequence of SEQ ID NO:9 or a variant thereof, and the light chain amino acid sequence of SEQ ID NO:2 or a variant thereof. In one embodiment, the the Fc-containing polypeptide is an antibody comprising the heavy chain amino acid sequence of SEQ ID NO:9 minus the last lysine (K) residue listed in SEQ ID NO:9.

In one embodiment, the Fc-containing polypeptide is an antibody comprising the heavy chain amino acid sequence of SEQ ID NO:12 or a variant thereof, and the light chain amino acid sequence of SEQ ID NO:11 or a variant thereof.

In one embodiment, the Fc-containing polypeptide is an antibody comprising the heavy chain amino acid sequence of SEQ ID NO:15 or a variant thereof, and the light chain amino acid sequence of SEQ ID NO:14 or a variant thereof.

In some embodiments, the Fc-containing polypeptides of the invention comprise N-glycans comprising sialic acid (including NANA, NGNA, and analogs and derivatives thereof). In one embodiment, the Fc-containing polypeptides of the invention comprise a mixture of α-2,3 and α-2,6 linked sialic acid. In another embodiment, the Fc-containing polypeptides of the invention comprise only α-2,6 linked sialic acid. In one embodiment, the Fc-containing polypeptides of the invention comprise α-2,6 linked sialic acid and comprise no detectable level of α-2,3 linked sialic acid. In one embodiment, the sialic acid is N-acetylneuraminic acid (NANA) or N-glycolylneuraminic acid (NGNA) or a mixture thereof. In another embodiment, the sialic acid is an analog or derivative of NANA or NGNA with acetylation at position 9 on the sialic acid. In one embodiment, the N-glycans on the Fc-containing polypeptides of the invention comprise NANA and no NGNA.

The N-glycans on the Fc-containing polypeptides of the invention can optionally comprise fucose. In one embodiment, the N-glycans on the Fc-containing polypeptides will comprise a mixture of fucosylated and non-fucosylated N-glycans. In another embodiment, the N-glycans on the Fc-containing polypeptides lack fucose.

In one embodiment, the Fc-containing polypeptide of the invention has one or more of the following properties when compared to a parent Fc-containing polypeptide: (i) reduced effector function; (ii) increased anti-inflammatory properties; (iii) increased sialylation; (iv) increased bioavailability (absorption or exposure), and (v) reduced binding to FcγRI, FcγRIIa, FcγRIIb, FcγRIIIa (FcγRIIIa-V158 or FcγRIIIa-F158), and FcγRIIIb. In one embodiment, the Fc-containing polypeptide of the invention has at least a 7, 10, 15, 30, 50, 100, 500 or 1000 fold reduction in effector function compared to a parent Fc-containing polypeptide. In one embodiment, the effector function is ADCC. In another embodiment, the effector function is CDC.

In one embodiment, the Fc-containing polypeptide of the invention has reduced ADCC activity when compared to a parent Fc-containing polypeptide. In one embodiment, the Fc-containing polypeptide has at least a 7, 10, 15, 30, 50 100, 500 or 1000 fold reduction in ADCC activity. In another embodiment, the Fc-containing polypeptide has at least a 100 fold reduction in ADCC activity. In another embodiment, the Fc-containing polypeptide has at least a 500 fold reduction in ADCC activity. In another embodiment, the Fc-containing polypeptide has at least a 1000 fold reduction in ADCC activity.

In another embodiment, the Fc-containing polypeptide of the invention has reduced CDC activity when compared to a parent Fc-containing polypeptide. In one embodiment, the Fc-containing polypeptide has at least 100 fold reduction in CDC activity.

In one embodiment, the Fc-containing polypeptide of the invention binds FcγRI, FcγRIIa, FcγRIIb, FcγRIIIa (FcγRIIIa-V158 or FcγRIIIa-F 158), and FcγRIIIb with reduced affinity when compared to a parent Fc-containing polypeptide. In one embodiment, an Fc-containing polypeptide of the invention binds FcγRIIa with a reduced affinity of at least 50 fold when compared to a parent Fc-containing polypeptide. In one embodiment, the Fc-containing polypeptide of the invention binds FcγRIIb with a reduced affinity of at least 20 fold when compared to a parent Fc-containing polypeptide. In one embodiment, the Fc-containing polypeptide of the invention binds FcγRIIIa LF with a reduced affinity of at least 10 fold when compared to a parent Fc-containing polypeptide. In one embodiment, the Fc-containing polypeptide of the invention binds FcγRIIIa LV with a reduced affinity of at least 1, 2 or 10 fold when compared to a parent Fc-containing polypeptide. In one embodiment, the Fc-containing polypeptide of the invention binds FcγRIIb, FcγRIIIa LF and FcγRIIIa LV with a reduced affinity when compared to a parent Fc-containing polypeptide.

In one embodiment, the Fc-containing polypeptide of the invention has increased anti-inflammatory properties compared to a parent Fc-containing polypeptide.

In one embodiment, the Fc-containing polypeptide of the invention has increased bioavailability (absorption or exposure) when injected parenterally compared to a parent Fc-containing polypeptide. In one embodiment, the Fc-containing polypeptide of the invention has increased bioavailability (absorption or exposure) when injected subcutaneously compared to a parent Fc-containing polypeptide.

In a one embodiment, the parent Fc-containing polypeptide comprises a native Fc region. In another embodiment, the parent Fc-containing polypeptide comprises a F243A mutation. In another embodiment, the parent Fc-containing polypeptide comprises a V264A mutation.

The invention also comprises a method for producing an Fc-containing polypeptide in a host cell comprising: (i) providing a host cell that has been genetically engineered to produce an Fc-containing polypeptide, wherein the host cell comprises a nucleic acid encoding mutations at amino acid positions 243 and 264 of the Fc region, wherein the mutations at positions 243 are selected from the group consisting of: F243A, F243G, F243S, F243T, F243V, F243L, F243I, F243D, F243Y, F243E, F243R, F243W and F243K and the mutations at position 264 are selected from the group consisting of: V264A, V264G, V264S, V264T, V264D, V264E, V264K, V264W, V264H, V264P, V264N, V264Q and V264L, wherein the numbering is according to the EU index as in Kabat; (ii) culturing the host cell under conditions which cause expression of the Fc-containing polypeptide; and (iii) isolating the Fc-containing polypeptide from the host cell. In one embodiment, the nucleic acid encodes the mutations F243A and V264A. In another embodiment, the nucleic acid encodes the mutations F243Y and V264G. In another embodiment, the nucleic acid encodes the mutations 243T and V264G. In another embodiment, the nucleic acid encodes the mutations F243L and V264A. In another embodiment, the nucleic acid encodes the mutations F243L and V264N. In another embodiment, the nucleic acid encodes the mutations F243V and V264G. In one embodiment, the Fc-containing polypeptide of the invention is an antibody or an antibody fragment. In one embodiment, the Fc-containing polypeptide is an antibody fragment comprising SEQ ID NO:18. In another embodiment, the Fc-containing polypeptide is an antibody fragment comprising SEQ ID NO:19. In another embodiment, the Fc-containing polypeptide is an antibody fragment consisting (or consisting essentially of) SEQ ID NO:18 or SEQ ID NO:19.

In one embodiment, the method for producing an Fc-containing polypeptide is carried out in a mammalian cell. In another embodiment, the method for producing an Fc-containing polypeptide is carried out in a plant cell. In another embodiment, the method for producing an Fc-containing polypeptide is carried out in bacteria. In another embodiment, the method for producing an Fc-containing polypeptide is carried out in an insect cell. In another embodiment, the method for producing an Fc-containing polypeptide is carried out in a lower eukaryotic cell. In another embodiment, the method for producing an Fc-containing polypeptide is carried out in a yeast cell. In one embodiment, the method for producing an Fc-containing polypeptide is carried out in Pichia pastoris.

In one embodiment, the Fc-containing polypeptide produced by the claimed method comprises N-glycans comprising sialic acid (including NANA, NGNA, and analogs and derivatives thereof). In one embodiment, the Fc-containing polypeptide produced by the claimed method has an N-glycan composition in which at least 40 mole %, 70 mole % or 90 mole % of the N-glycans on the Fc-containing polypeptide are sialylated (have a structure selected from SA₍₁₋₄₎Gal₍₁₋₄₎GlcNAc₍₂₋₄₎Man₃GlcNAc₂ or SAGalGlcNAcMan₅GlcNAc₂₎. In one embodiment, least 47 mole % of the N-glycans on the antibodies have the structure SA₂Gal₂GlcNAc₂Man₃GlcNAc₂. In another embodiment, least 47 mole % of the N-glycans on the antibodies have the structure NANA₂Gal₂GlcNAc₂Man₃GlcNAc₂. In another embodiment, least 66 mole % of the N-glycans on the antibodies have the structure SA₂Gal₂GlcNAc₂Man₃GlcNA_(2.) In another embodiment, least 66 mole % of the N-glycans on the antibodies have the structure NANA₂Gal₂GlcNAc₂Man₃GlcNAc_(2.) In one embodiment, the Fc-containing polypeptides produced by the claimed method comprise a mixture of α-2,3 and α-2,6 linked sialic acid. In another embodiment, the Fc-containing polypeptides comprise only α-2,6 linked sialic acid. In one embodiment, the Fc-containing polypeptides of the invention comprise α-2,6 linked sialic acid and comprise no detectable level of α-2,3 linked sialic acid. In one embodiment, the sialic acid is N-acetylneuraminic acid (NANA) or N-glycolylneuraminic acid (NGNA) or a mixture thereof. In another embodiment, the sialic acid is an analog or derivative of NANA or NGNA with acetylation at position 9 on the sialic acid. In one embodiment, the N-glycans on the Fc-containing polypeptides produced by the claimed method comprise NANA and no NGNA.

The N-glycans on the Fc-containing polypeptides produced by the claimed method can optionally comprise fucose. In one embodiment, the N-glycans on the Fc-containing polypeptides produced by the claimed method comprise a mixture of fucosylated and non-fucosylated N-glycans. In one embodiment, the N-glycans on the Fc-containing polypeptides produced by the claimed method lack fucose.

In one embodiment, the Fc-containing polypeptide produced by the claimed method has an N-glycan composition in which the amount and percentage of total sialylated N-glycans is increased relative to a parent Fc-containing polypeptide.

In some embodiments, the Fc-containing polypeptide produced by the claimed method has one or more of the following properties when compared to a parent Fc-containing polypeptide: (i) reduced effector function; (ii) increased anti-inflammatory properties; (iii) increased sialylation; (iv) increased bioavailability (absorption or exposure), and (v) reduced binding to FcγRI, FcγRIIa, FcγRIIb and FcγRIIIa. In one embodiment, the Fc-containing polypeptide of the invention has at least a 7, 10, 15, 30, 50, 100, 500 or 1000 fold reduction in effector function relative to a parent Fc-containing polypeptide. In one embodiment, the effector function is ADCC. In another embodiment, the effector function is CDC.

In one embodiment, the Fc-containing polypeptide of the invention has reduced ADCC activity when compared to a parent Fc-containing polypeptide. In one embodiment, the Fc-containing polypeptide has at least a 7, 10, 15, 30, 50 100, 500 or 1000 fold reduction in ADCC activity. In another embodiment, the Fc-containing polypeptide has at least a 100 fold reduction in ADCC activity. In another embodiment, the Fc-containing polypeptide has at least a 500 fold reduction in ADCC activity. In another embodiment, the Fc-containing polypeptide has at least a 1000 fold reduction in ADCC activity.

In another embodiment, the Fc-containing polypeptide produced by the claimed method has reduced CDC activity when compared to a parent Fc-containing polypeptide. In one embodiment, the Fc-containing polypeptide has at least 100 fold reduction in CDC activity.

In one embodiment, the Fc-containing polypeptide produced by the claimed method binds FcγRI, FcγRIIa, FcγRIIb, FcγRIIIa (FcγRIIIa-V158 or FcγRIIIa-F158), and FcγRIIIb with reduced affinity when compared to a parent Fc-containing polypeptide. In one embodiment, the Fc-containing polypeptide of the invention binds FcγRIIa with a reduced affinity of at least 50 fold when compared to a parent Fc-containing polypeptide. In one embodiment, the Fc-containing polypeptide of the invention binds FcγRIIb with a reduced affinity of at least 20 fold when compared to a parent Fc-containing polypeptide. In one embodiment, the Fc-containing polypeptide of the invention binds FcγRIIIa LF with a reduced affinity of at least 10 fold when compared to a parent Fc-containing polypeptide. In one embodiment, the Fc-containing polypeptide of the invention binds FcγRIIIa LV with a reduced affinity of at least 1, 2 or 10 fold when compared to a parent Fc-containing polypeptide. In one embodiment, the Fc-containing polypeptide of the invention binds FcγRIIb, FcγRIIIa LF and FcγRIIIa LV with a reduced affinity when compared to a parent Fc-containing polypeptide.

In one embodiment, the Fc-containing polypeptide produced by the claimed method has increased anti-inflammatory properties relative to a parent Fc-containing polypeptide.

In one embodiment, the Fc-containing polypeptide produced by the claimed method has increased bioavailability (absorption or exposure) when injected parenterally compared to a parent Fc-containing polypeptide. In one embodiment, the Fc-containing polypeptide produced by the claimed method has increased bioavailability (absorption or exposure) when injected subcutaneously compared to a parent Fc-containing polypeptide.

In a one embodiment, the parent Fc-containing polypeptide comprises a native Fc region. In another embodiment, the parent Fc-containing polypeptide comprises a F243A mutation. In another embodiment, the parent Fc-containing polypeptide comprises a V264A mutation.

The invention also comprises a method of reducing the effector function of an Fc-containing polypeptide, comprising introducing mutations at positions 243 and 264 of a parent Fc-containing polypeptide, wherein said Fc containing polypeptide has decreased effector function when compared to the parent Fc-containing polypeptide, wherein the numbering is according to the EU index as in Kabat. In a one embodiment, the Fc-containing polypeptide comprises mutations F243A and V264A. In another embodiment, the nucleic acid encodes the mutations F243Y and V264G. In another embodiment, the nucleic acid encodes the mutations 243T and V264G. In another embodiment, the nucleic acid encodes the mutations F243L and V264A. In another embodiment, the nucleic acid encodes the mutations F243L and V264N. In another embodiment, the nucleic acid encodes the mutations F243V and V264G. In one embodiment, the effector function is ADCC. In another embodiment, the effector function is CDC. In one embodiment, the Fc-containing polypeptide of the invention is an antibody or an antibody fragment. In one embodiment, the Fc-containing polypeptide is an antibody fragment comprising SEQ ID NO:18. In another embodiment, the Fc-containing polypeptide is an antibody fragment comprising SEQ ID NO:19. In another embodiment, the Fc-containing polypeptide is an antibody fragment consisting (or consisting essentially of) SEQ ID NO:18 or SEQ ID NO:19. In a one embodiment, the parent Fc-containing polypeptide comprises a native Fc region. In another embodiment, the parent Fc-containing polypeptide comprises a F243A mutation. In another embodiment, the parent Fc-containing polypeptide comprises a V264A mutation.

The invention also comprises a method of increasing the anti-inflammatory properties of an Fc-containing polypeptide, comprising introducing mutations at positions 243 and 264 of a parent Fc-containing polypeptide, wherein the numbering is according to the EU index as in Kabat, wherein said Fc containing polypeptide has increased anti-inflammatory activity when compared to a parent Fc-containing polypeptide. In a one embodiment, the Fc-containing polypeptide comprises mutations F243A and V264A. In another embodiment, the Fc-containing polypeptide comprises mutations F243Y and V264G. In another embodiment, the Fc-containing polypeptide comprises mutations 243T and V264G. In another embodiment, the Fc-containing polypeptide comprises mutations F243L and V264A. In another embodiment, the Fc-containing polypeptide comprises mutations F243L and V264N. In another embodiment, the Fc-containing polypeptide comprises mutations F243V and V264G. In one embodiment, the Fc-containing polypeptide of the invention is an antibody or an antibody fragment. In one embodiment, the Fc-containing polypeptide is an antibody or antigen binding fragment thereof that binds to an antigen selected from the group consisting of: TNF-α, IL-1, IL-2, IL-4, IL-5, IL-6, IL-8, IL-9, IL-10, IL-12, IL-15, IL-17, IL-18, IL-20, IL-21, IL-22, IL-23, IL-23R, IL-25, IL-27, IL-33, CD2, CD4, CD11A, CD14, CD18, CD19, CD23, CD25, CD40, CD40L, CD20, CD52, CD64, CD80, CD147, CD200, CD200R, TSLP, TSLPR, PD-1, PDL1, CTLA4, VLA-4, VEGF, PCSK9, α4β7-integrin, E-selectin, Fact II, ICAM-3, beta2-integrin, IFNγ, C5, CBL, LCAT, CR3, MDL-1, GITR, ADDL, CGRP, TRKA, IGF1R, RANKL, GTC, or the receptor for any of the above mentioned molecules. In a one embodiment, the Fc-containing polypeptide will bind to TNF-α. In another embodiment, the Fc-containing polypeptide will bind to Her2. In another embodiment, the Fc-containing polypeptide will bind to PCSK9. In one embodiment, the Fc-containing polypeptide of the invention is an antibody fragment comprising SEQ ID NO:18. In another embodiment, the Fc-containing polypeptide of the invention is an antibody fragment comprising SEQ ID NO:19. In another embodiment, the Fc-containing polypeptide of the invention is an antibody fragment consisting (or consisting essentially of) SEQ ID NO:18 or SEQ ID NO:19. In one embodiment, the parent Fc-containing polypeptide comprises a native Fc region. In another embodiment, the parent Fc-containing polypeptide comprises a F243A mutation. In another embodiment, the parent Fc-containing polypeptide comprises a V264A mutation.

The invention also comprises a method of increasing the anti-inflammatory properties of an Fc-containing polypeptide comprising: selecting a parent Fc-containing polypeptide that is useful in treating inflammation (for example, an antibody or immunoadhesin that binds to an antigen that is involved in inflammation) and introducing mutations at positions 243 and 264 of the Fc-region, wherein the numbering is according to the EU index as in Kabat, wherein the Fc-containing polypeptide has increased anti-inflammatory activity when compared to the parent Fc-containing polypeptide. In a one embodiment, the Fc-containing polypeptide comprises mutations F243A and V264A. In another embodiment, the Fc-containing polypeptide comprises mutations F243Y and V264G. In another embodiment, the Fc-containing polypeptide comprises mutations 243T and V264G. In another embodiment, the Fc-containing polypeptide comprises mutations F243L and V264A. In another embodiment, the Fc-containing polypeptide comprises mutations F243L and V264N. In another embodiment, the Fc-containing polypeptide comprises mutations F243V and V264G. In one embodiment, the Fc-containing polypeptide of the invention is an antibody or an antibody fragment. In one embodiment, the Fc-containing polypeptide is an antibody or antigen binding fragment thereof that binds to an antigen selected from the group consisting of: TNF-α, IL-1, IL-2, IL-4, IL-5, IL-6, IL-8, IL-9, IL-10, IL-12, IL-15, IL-17, IL-18, IL-20, IL-21, IL-22, IL-23, IL-23R, IL-25, IL-27, IL-33, CD2, CD4, CD11A, CD14, CD18, CD19, CD23, CD25, CD40, CD40L, CD20, CD52, CD64, CD80, CD147, CD200, CD200R, TSLP, TSLPR, PD-1, PDL1, CTLA4, VLA-4, VEGF, PCSK9, α4β7-integrin, E-selectin, Fact II, ICAM-3, beta2-integrin, IFNγ, C5, CBL, LCAT, CR3, MDL-1, GITR, ADDL, CGRP, TRKA, IGF1R, RANKL, GTC, or the receptor for any of the above mentioned molecules. In a one embodiment, the Fc-containing polypeptide will bind to TNF-α. In another one embodiment, the Fc-containing polypeptide will bind to Her2. In another one embodiment, the Fc-containing polypeptide will bind to PCSK9. In one embodiment, the Fc-containing polypeptide is an antibody fragment comprising SEQ ID NO:18. In another embodiment, the Fc-containing polypeptide is an antibody fragment comprising SEQ ID NO:19. In another embodiment, the Fc-containing polypeptide is an antibody fragment consisting (or consisting essentially of) SEQ ID NO:18 or SEQ ID NO:19. In one embodiment, the parent Fc-containing polypeptide comprises a native Fc region. In another embodiment, the parent Fc-containing polypeptide comprises a F243A mutation. In another embodiment, the parent Fc-containing polypeptide comprises a V264A mutation.

The invention also comprises a method of treating an inflammatory condition in a subject in need thereof comprising: administering to the subject a therapeutically effective amount of an Fc-containing polypeptide comprising mutations at positions 243 and 264, wherein the numbering is according to the EU index as in Kabat. In one embodiment, the Fc-containing polypeptide decreases the expression of a gene selected from the group consisting of: IL-1β, IL-6, RANKL, TRAP, ATP6v0d2, MDL-1, DAP12, CD11b, TIMP-1, MMP9, CTSK, PU-1, MCP1, MIP1α, Cxcl1-Groa, CXcl2-Grob, CD18, TNF, FcγRI, FcγRIIb, FcγRIII and FcγRIV. In a one embodiment, the Fc-containing polypeptide comprises mutations F243A and V264A. In another embodiment, the nucleic acid encodes the mutations F243Y and V264G. In another embodiment, the nucleic acid encodes the mutations 243T and V264G. In another embodiment, the nucleic acid encodes the mutations F243L and V264A. In another embodiment, the nucleic acid encodes the mutations F243L and V264N. In another embodiment, the nucleic acid encodes the mutations F243V and V264G. In one embodiment, the Fc-containing polypeptide is administered parenterally. In one embodiment, the Fc-containing polypeptide is administered subcutaneously. In one embodiment, the Fc-containing polypeptide is an antibody or antigen binding fragment thereof. In one embodiment, the Fc-containing polypeptide is an antibody or antigen binding fragment thereof that is useful in treating an inflammatory condition. In one embodiment, the antibody or antigen binding fragment thereof binds to an antigen selected from the group consisting of: TNF-α, IL-1, IL-2, IL-4, IL-5, IL-6, IL-8, IL-9, IL-10, IL-12, IL-15, IL-17, IL-18, IL-20, IL-21, IL-22, IL-23, IL-23R, IL-25, IL-27, IL-33, CD2, CD4, CD11A, CD14, CD18, CD19, CD23, CD25, CD40, CD40L, CD20, CD52, CD64, CD80, CD147, CD200, CD200R, TSLP, TSLPR, PD-1, PDL1, CTLA4, VLA-4, VEGF, PCSK9, α4β7-integrin, E-selectin, Fact II, ICAM-3, beta2-integrin, IFNγ, C5, CBL, LCAT, CR3, MDL-1, GITR, ADDL, CGRP, TRKA, IGF1R, RANKL, GTC, or the receptor for any of the above mentioned molecules. In one embodiment, the Fc-containing polypeptide will bind to TNF-α. In another embodiment, the Fc-containing polypeptide will bind to Her2. In another embodiment, the Fc-containing polypeptide will bind to PCSK9. In one embodiment, the Fc-containing polypeptide is an antibody fragment comprising SEQ ID NO:18. In another embodiment, the Fc-containing polypeptide is an antibody fragment comprising SEQ ID NO:19. In another embodiment, the Fc-containing polypeptide is an antibody fragment consisting (or consisting essentially of) SEQ ID NO:18 or SEQ ID NO:19

Another invention disclosed herein relates to a pharmaceutical composition comprising an Fc-containing polypeptide, wherein at least 70% of the N-glycans on the Fc-containing polypeptide comprise an oligosaccharide structure selected from the group consisting of SA₍₁₋₄₎Gal₍₁₋₄₎GlcNAc₍₂₋₄₎Man₃GlcNAc₂ and SAGalGlcNAcMan5GlcNAc_(2,) wherein the Fc-containing polypeptide comprises mutations at amino acid positions 243 and 264 of the Fc region, wherein the numbering is according to the EU index as in Kabat. In one embodiment, the mutations are F243A and V264A. In another embodiment, the mutations are F243Y and V264G. In another embodiment, the nucleic acid encodes the mutations 243T and V264G. In another embodiment, the mutations are F243L and V264A. In another embodiment, the mutations are F243L and V264N. In another embodiment, the mutations are F243V and V264G. In one embodiment, at least 47 mole % of the N-glycans have the structure SA₂Gal₂GlcNAc₂Man₃GlcNAc₂. In another embodiment, at least 47 mole % of the N-glycans have the structure NANA₂Gal₂GlcNAc₂Man₃GlcNAc_(2.) In one embodiment, the sialylated N-glycans comprise a mixture of α-2,3 and α-2,6 linked sialic acid. In another embodiment, the sialylated N-glycans comprise only α-2,6 linked sialic acid. In another embodiment, the sialylated N-glycans comprise α-2,6 linked sialic acid and comprise no detectable level of α-2,3 linked sialic acid. In one embodiment, the sialic acid is N-acetylneuraminic acid (NANA) or N-glycolylneuraminic acid (NGNA) or a mixture thereof. In another embodiment, the sialic acid is an analog or derivative of NANA or NGNA with acetylation at position 9 on the sialic acid. In one embodiment, the N-glycans on the Fc-containing polypeptides comprise NANA and no NGNA. In one embodiment, the Fc-containing polypeptide is an antibody fragment comprising SEQ ID NO:18. In another embodiment, the Fc-containing polypeptide is an antibody fragment comprising SEQ ID NO:19. In another embodiment, the Fc-containing polypeptide is an antibody fragment consisting (or consisting essentially of) SEQ ID NO:18 or SEQ ID NO:19

Another invention disclosed herein relates to a pharmaceutical composition comprising an Fc-containing polypeptide, wherein at least 70% of the N-glycans on the Fc-containing polypeptide comprise an oligosaccharide structure selected from the group consisting of SA₍₁₋₄₎Gal₍₁₋₄₎GlcNAc₍₂₋₄₎Man₃GlcNAc₂ and SAGalGlcNAcMan5GlcNAc_(2,) wherein the sialic acid residues are attached exclusively via an α-2,6 linkage, wherein the N-glycans lack fucose, and wherein the Fc-containing polypeptide comprises mutations at amino acid positions 243 and 264 of the Fc region, wherein the numbering is according to the EU index as in Kabat. In one embodiment, the mutations are F243A and V264A. In another embodiment, the mutations are F243Y and V264G. In another embodiment, the nucleic acid encodes the mutations 243T and V264G. In another embodiment, the mutations are F243L and V264A. In another embodiment, the mutations are F243L and V264N. In another embodiment, the mutations are F243V and V264G. In one embodiment, at least 47 mole % of the N-glycans have the structure SA₂Gal₂GlcNAc₂Man₃GlcNAc_(2.) In another embodiment, at least 47 mole % of the N-glycans have the structure NANA₂Gal₂GlcNAc₂Man₃GlcNAc_(2.) In one embodiment, the sialylated N-glycans comprise a mixture of α-2,3 and α-2,6 linked sialic acid. In another embodiment, the sialylated N-glycans comprise only α-2,6 linked sialic acid. In another embodiment, the sialylated N-glycans comprise α-2,6 linked sialic acid and comprise no detectable level of α-2,3 linked sialic acid. In one embodiment, the sialic acid is N-acetylneuraminic acid (NANA) or N-glycolylneuraminic acid (NGNA) or a mixture thereof. In another embodiment, the sialic acid is an analog or derivative of NANA or NGNA with acetylation at position 9 on the sialic acid. In one embodiment, the N-glycans on the Fc-containing polypeptides comprise NANA and no NGNA. In one embodiment, the Fc-containing polypeptide is an antibody fragment comprising SEQ ID NO:18. In another embodiment, the Fc-containing polypeptide is an antibody fragment comprising SEQ ID NO:19. In another embodiment, the Fc-containing polypeptide is an antibody fragment consisting (or consisting essentially of) SEQ ID NO:18 or SEQ ID NO:19

The invention also comprises an Fc-containing polypeptide comprising a heavy chain and a light chain, wherein the heavy chain comprises the amino acid sequence of SEQ ID NO:9 or a variant thereof and the light chain comprises the amino acid sequence of SEQ ID NO:2 or a variant thereof, wherein the variant comprises one or more of the following properties when compared to an antibody comprising the heavy chain amino acid sequence of SEQ ID NO:1 and the light chain amino acid sequence of SEQ ID NO:2: reduced effector function, increased anti-inflammatory properties; increased sialylation; increased bioavailability (absorption or exposure) when administered parenterally, and reduced binding to FcγRI, FcγRIIa, FcγRIIb and FcγRIIIa. The invention also comprises an Fc-containing polypeptide comprising a heavy chain and a light chain, wherein the heavy chain comprises the amino acid sequence of SEQ ID NO:12 or a variant thereof and the light chain comprises the amino acid sequence of SEQ ID NO:11 or a variant thereof, wherein the variant comprises one or more of the following properties when compared to an antibody comprising the heavy chain amino acid sequence of SEQ ID NO:10 and the light chain amino acid sequence of SEQ ID NO:11: reduced effector function, increased anti-inflammatory properties, increased sialylation, increased bioavailability (absorption or exposure) when administered parenterally, and reduced binding to FcγRI, FcγRIIa, FcγRIIb, FcγRIIIa and FcγRIIIb. The invention also comprises an Fc-containing polypeptide comprising a heavy chain and a light chain, wherein the heavy chain comprises the amino acid sequence of SEQ ID NO:15 or a variant thereof, and the light chain comprises the amino acid sequence of SEQ ID NO:14 or a variant thereof, wherein the variant comprises one or more of the following properties when compared to an antibody comprising the heavy chain amino acid sequence of SEQ ID NO:13 and the light chain amino acid sequence of SEQ ID NO:14: reduced effector function, increased anti-inflammatory properties, increased sialylation, increased bioavailability (absorption or exposure) when administered parenterally, and reduced binding to FcγRI, FcγRIIa, FcγRIIb, FcγRIIIa and FcγRIIIb. In one embodiment, the variant comprises up to 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more conservative or non conservative amino acid substitutions. In one embodiment, the variant comprises at least 75%, 80%, 85%, 90%, 95%, 98% or 99% sequence identity with the claimed sequence

The invention also comprises a method of increasing the anti-inflammatory properties of an Fc-containing polypeptide, comprising introducing a mutation at position 243 or a mutation at position 264 of a parent Fc-contaning polypeptide, wherein the numbering is according to the EU index as in Kabat, wherein said Fc containing polypeptide has increased anti-inflammatory function when compared to the parent Fc-containing polypeptide. The invention also comprises a method of increasing the anti-inflammatory properties of an Fc-containing polypeptide comprising: selecting a parent Fc-containing polypeptide that is useful in treating inflammation (for example, an antibody or immunoadhesin that binds to an antigen that is involved in inflammation) and introducing introducing a mutation at position 243 or a mutation at position 264 of a parent Fc-containing polypeptide, wherein the numbering is according to the EU index as in Kabat, wherein the Fc-containing polypeptide has increased anti-inflammatory properties when compared to the parent Fc-containing polypeptide. In one embodiment, the Fc-containing polypeptide comprises mutation F243A. In another embodiment, the Fc-containing polypeptide comprises mutation V264A. In one embodiment, the parent Fc-containing polypeptide comprises a native Fc region.

The invention also comprises a method of treating an inflammatory condition in a subject in need thereof comprising: administering to the subject a therapeutically effective amount of an Fc-containing polypeptide a mutation at position 243 or a mutation at position 264 of a parent Fc-containing polypeptide, wherein the numbering is according to the EU index as in Kabat. In one embodiment, the Fc-containing polypeptide is administered parenterally. In one embodiment, the Fc-containing polypeptide is administered subcutaneously. In one embodiment, the Fc-containing polypeptide comprises mutation F243A. In another embodiment, the Fc-containing polypeptide comprises mutation V264A. In one embodiment, the parent Fc-containing polypeptide comprises a native Fc region.

In any of the above embodiment, an increase in anti-inflammatory activity can be detected using any method known in the art. In one embodiment, an increase in anti-inflammatory activity is detected by measuring a decrease in the expression of a gene selected from the group consisting of: IL-1β, IL-6, RANKL, TRAP, ATP6v0d2, MDL-1, DAP12, CD11b, TIMP-1, MMP9, CTSK, PU-1, MCP1, MIP1α, Cxcl1-Groa, CXcl2-Grob, CD18, TNF, FcγRI, FcγRIIb, FcγRIII and FcγRIV.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graphic representation of pGLY3483, the F243A and V264A double mutein expression plasmid. Both heavy and light chains were under the control of a methanol inducible promoter, AOX1. The PpTrp2 gene was the locus applied to integrate the entire cassette. With the exception of the mutations on the heavy chain, expression plasmid structure was the same for the wild type (parent), single F243A mutein, single V264A mutein, and the double mutein expression plasmids.

FIG. 2 is a representation of the gels from an SDS-PAGE analysis characterizing the non-reduced (NR) and reduced (R) antibodies produced by the materials and methods herein. Lane 1 contains an anti-Her2 monoclonal antibody, Her2; Lane 2 contains a single Fc mutein, F243A; Lane 3 contains a single Fc mutein, V264A; and Lane 4 contains a double Fc mutein, F243A/V264A.

FIG. 3 illustrates antigen affinity for various antibodies produced by the materials and methods herein as determined by a cell based assay using an SK-BR3 cell line, a Her2-overexpressing human breast cancer line. ▪—Her2; ♦—F243A/V264A GS6.0 glycosylation; ▴—F243A with GS6.0 glycosylation; ▾—V264A with GS6.0 glycosylation; ⋄—Control IgG; ×—Pichia pastoris Her2 produced with GFI 5.0 glycosylation.

FIG. 4 illustrates a MALDI-TOF MS analysis of N-glycans of a Pichia pastoris Her2 antibody produced in GFI 5.0 strain YDX477. The peaks are Man₅GlcNAc₂, 1261.24 (GS2.0), GlcNAc₂Man₃GlcNAc₂, 1343.50 (G0) (predominant), GalGlcNAc₂Man₃GlcNAc₂, 1505.97 (G1), and Gal₂GlcNAc₂Man₃GlcNAc₂, 1668.47 (G2).

FIG. 5 illustrates a MALDI-TOF MS analysis of N-glycans of a single Fc mutein, F243A, antibody produced in GFI 5.0 strain YDX551. The peaks are Man₅GlcNAc₂, 1261.05, GlcNAc₂Man₃GlcNAc_(2,) 1343.71, GalGlcNAc₂Man₃GlcNAc₂, 1506.62, and Gal₂GlcNAc₂Man₃GlcNAc₂, 1668.97 (predominant).

FIG. 6 illustrates a MALDI-TOF MS analysis of N-glycans of a single Fc mutein, V264A, antibody produced in GFI 5.0 strain YDX551. The peaks are Man₅GlcNAc_(2,) 1261.98, GalGlcNAc₂Man₃GlcNAc₂, 1505.45, and Gal₂GlcNAc₂Man₃GlcNAc₂, 1668.85 (predominant).

FIG. 7 illustrates a MALDI-TOF MS analysis of N-glycans of a double Fc mutein, F243A/V264A, antibody produced in GFI 5.0 strain YDX557. The major peak corresponds to Gal₂GlcNAc₂Man₃GlcNAc₂, 1668.39.

FIG. 8 illustrates a MALDI-TOF MS analysis of N-glycans of a double Fc mutein, F243A/V264A, antibody produced in GFI 6.0 strain YGLY4563. The double peaks at 2224.28 and 2245.83 (predominant) correspond to NANAGal₂GlcNAc₂Man₃GlcNAc₂ and NANA2Gal₂GlcNAc₂Man₃GlcNAc₂, respectively.

FIGS. 9A-9D are graphic representations of the FcγR binding for various antibodies produced by the materials and methods described in Example 11: FcγRIIIaLF (FIG. 9A); FcγRI (FIG. 9B); FcγRIIb/c (FIG. 9C); and FcγRIIIaLV (FIG. 9D). For FIGS. 9A-9D: ▪—Her2; ▴—F243A produced in GFI 6.0; ▾—V264A produced in GFI 6.0; ♦—F243A/V264A produced in GFI 6.0; —F243A/V264A produced in GFI 6.0 and treated with PNGase.

FIG. 10 is a graphic representation of the Clq binding for various antibodies produced by the materials and methods described in Example 12: ⋄—anti-CD20 antibody, a positive control; ▪—Her2; ▴—F243A produced with GS6.0 glycosylation; ▾—V264A produced with GS6.0 glycosylation; ♦—F243A/V264A produced with GS6.0 glycosylation; —F243A/V264A with GS6.0 glycosylation and PNGase.

FIG. 11 is a graphic representation of the ADCC response for the various antibodies produced by the materials and methods described in Example 13: ▪—Her2; ▴—F243A produced with GS6.0 glycosylation; ▾—V264A produced with GS6.0 glycosylation; ♦—F243A/V264A produced with GS6.0 glycosylation ; ⋄—NK cell killing without antibody; ×—Her2 produced in GFI2.0.

FIG. 12 is a graphic representation of serum monoclonal antibody concentration over time for mice injected with: ▪—Her2; ×—Her2 produced in GFI 5.0; ♦—F243A/V264A produced in GFI 6.0 as described in Example 14.

FIGS. 13A-13E are graphic representations of the FcγR binding for various antibodies described in Example 15.

FIGS. 14A-14E are graphic representations of the ADCC response for the various antibodies produced by the materials and methods described in Example 16. The results in FIGS. 14A and 14B were from experiments using heterozygous F/V effector cells. The results in FIGS. 14C and 14D were from experiments using F/F effector cells. The results in FIG. 14E were from an experiment using V/V effector cells.

FIG. 15 is a graphic representation of the ADCC activity of the anti-Her2 Fc double mutant compared to the assumed additive reference curve of each of the single mutants as described in Example 17.

FIGS. 16A-16D are graphic representations of the ADCC response for the various antibodies produced by the materials and methods described in Example 18.

FIG. 17 is a graphic representation of the CDC response for the various antibodies produced by the materials and methods described in Example 19.

FIGS. 18A-18B are graphic representations of the effect of the Fc muteins of the invention in an AIA model described in Example 20.

FIGS. 19A-19B are graphic representations of the effect of the Fc muteins of the invention in an AIA model described in Example 21.

FIGS. 20-1 and 20-2 are graphic representations of the FcγR binding for the anti-TNFα antibodies described in Example 22.

FIGS. 21A-21B are graphic representations of the FcγR binding for the anti-TNFα antibodies described in Example 23.

FIG. 22 is a graphic representation of the effect of the Fc muteins of the invention in an AIA model described in Example 24.

DETAILED DESCRIPTION OF THE INVENTION Definitions

The term “G0” when used herein refers to a complex bi-antennary oligosaccharide without galactose or fucose, GlcNAc₂Man₃GlcNAc₂.

The term “G1” when used herein refers to a complex bi-antennary oligosaccharide without fucose and containing one galactosyl residue, GalGlcNAc₂Man₃GlcNAc₂.

The term “G2” when used herein refers to a complex bi-antennary oligosaccharide without fucose and containing two galactosyl residues, Gal₂GlcNAc₂Man₃GlcNAc₂.

The term “G0F” when used herein refers to a complex bi-antennary oligosaccharide containing a core fucose and without galactose, GlcNAc₂Man₃GlcNAc₂F.

The term “G1F” when used herein refers to a complex bi-antennary oligosaccharide containing a core fucose and one galactosyl residue, GalGlcNAc₂Man₃GlcNAc₂F.

The term “G2F” when used herein refers to a complex bi-antennary oligosaccharide containing a core fucose and two galactosyl residues, Gal₂GlcNAc₂Man₃GlcNAc₂F.

The term “Man5” when used herein refers to the oligosaccharide structure shown as

The term “GFI 5.0” when used herein refers to glycoengineered Pichia pastoris strains that produce glycoproteins having predominantly Gal₂GlcNAc₂Man₃GlcNAc₂ N-glycans.

The term “GFI 6.0” when used herein refers to glycoengineered Pichia pastoris strains that produce glycoproteins having predominantly NANA₂Gal₂GlcNAc₂Man₃GlcNAc₂ N-glycans.

The term “GS5.0”, when used herein refers to the N-glycosylation structure Gal₂GlcNAc₂Man₃GlcNAc₂.

The term “GS5.5”, when used herein refers to the N-glycosylation structure NANAGal₂GlcNAc₂Man₃GlcNAc₂, which when produced in Pichia pastoris strains to which α2,6 sialyl transferase has been glycoengineered result in α2,6-linked sialic acid and which when produced in Pichia pastoris strains to which α2,3 sialyl transferase has been glycoengineered result in α2,3-linked sialic acid.

The term “GS6.0”, when used herein refers to the N-glycosylation structure NANA₂Gal₂GlcNAc₂Man₃GlcNAc₂, which when produced in Pichia pastoris strains to which α2,6 sialyl transferase has been glycoengineered result in α2,6-linked sialic acid and which when produced in Pichia pastoris strains to which α2,3 sialyl transferase has been glycoengineered result in α2,3-linked sialic acid.

The term “wild type” or “wt” when used herein in connection to a Pichia pastoris strain refers to a native Pichia pastoris strain that has not been subjected to genetic modification to control glycosylation.

The term “antibody”, when used herein refers to an immunoglobulin molecule capable of binding to a specific antigen through at least one antigen recognition site located in the variable region of the immunoglobulin molecule. As used herein, the term encompasses not only intact polyclonal or monoclonal antibodies, consisting of four polypeptide chains, i.e. two identical pairs of polypeptide chains, each pair having one “light” chain (LC) (about 25 kDa) and one “heavy” chain (HC) (about 50-70 kDa), but also fragments thereof, such as Fab, Fab′, F(ab′)₂, Fv, single chain (ScFv), mutants thereof, fusion proteins comprising an antibody portion, and any other modified configuration of an immunoglobulin molecule that comprises an antigen recognition site and at least the portion of the C_(H)2 domain of the heavy chain immunoglobulin constant region which comprises an N-linked glycosylation site of the C_(H)2 domain, or a variant thereof. As used herein the term includes an antibody of any class, such as IgG (for example, IgG1, IgG2, IgG3 or IgG4), IgM, IgA, IgD and IgE, respectively.

The term “consensus sequence of C_(H)2” when used herein refers to the amino acid sequence of the C_(H)2 domain of the heavy chain constant region containing an N-linked glycosylation site which was derived from the most common amino acid sequences found in C_(H)2 domains from a variety of antibodies.

The term “Fc region” is used to define a C-terminal region of an immunoglobulin heavy chain. The “Fc region” may be a native sequence Fc region or a variant Fc region. Although the boundaries of the Fc region of an immunoglobulin heavy chain might vary, the human IgG heavy chain Fc region is usually defined to stretch from an amino acid residue at position Cys226, or from Pro230, to the carboxyl-terminus thereof. The Fc region of an immunoglobulin comprises two constant domains, CH2 and CH3, and can optionally comprise a hinge region. In one embodiment, the Fc region comprises the amino acid sequence of SEQ ID NO:18. In one embodiment, the Fc region comprises the amino acid sequence of SEQ ID NO:19. In another embodiment, the Fc region comprises the amino acid sequence of SEQ ID NO:18, with the addition of a lysine (K) residue at the 5′ end. The Fc region contains a single N-linked glycosylation site in the Ch2 domain that corresponds to the Asn297 site of a full-length heavy chain of an antibody.

The term “Fc-containing polypeptide” refers to a polypeptide, such as an antibody or immunoadhesin, which comprises an Fc region. This term encompasses polypeptides comprising or consisting of (or consisting essentially of) an Fc region. Polypeptides comprising an Fc region can be generated by papain digestion of antibodies or by recombinant DNA technology.

The term “parent antibody”, “parent immunoglobulin” or “parent Fc-containing polypeptide” when used herein refers to an antibody or Fc-containing polypeptide which lacks the Fc region mutations disclosed herein. A parent Fc-containing polypeptide may comprise a native sequence Fc region or an Fc region with pre-existing amino acid sequence modifications. A native sequence Fc region comprises an amino acid sequence identical to the amino acid sequence of an Fc region found in nature. Native sequence Fc regions include the native sequence human IgG1 Fc region, the native sequence human IgG2 Fc region, the native sequence human IgG3 Fc region and the native sequence human IgG4 Fc region as well as naturally occurring variants thereof. When used as a comparator, a parent antibody or a parent Fc-containing polypeptide can be expressed in any cell. In one embodiment, the parent antibody or a parent Fc-containing polypeptide is expressed in the same cell as the Fc-containing polypeptide of the invention.

As used herein, the term “immunoadhesin” designates antibody-like molecules which combine the “binding domain” of a heterologous “adhesin” protein (e.g. a receptor, ligand or enzyme) with an immunoglobulin constant domain. Structurally, the immunoadhesins comprise a fusion of the adhesin amino acid sequence with the desired binding specificity which is other than the antigen recognition and binding site (antigen combining site) of an antibody (i.e. is “heterologous”) and an immunoglobulin constant domain sequence. The term “ligand binding domain” as used herein refers to any native cell-surface receptor or any region or derivative thereof retaining at least a qualitative ligand binding ability of a corresponding native receptor. In a specific embodiment, the receptor is from a cell-surface polypeptide having an extracellular domain that is homologous to a member of the immunoglobulin supergenefamily. Other receptors, which are not members of the immunoglobulin supergenefamily but are nonetheless specifically covered by this definition, are receptors for cytokines, and in particular receptors with tyrosine kinase activity (receptor tyrosine kinases), members of the hematopoietin and nerve growth factor which predispose the mammal to the disorder in question. In one embodiment, the disorder is cancer. Methods of making immunoadhesins are well known in the art. See, e.g., WO00/42072.

The term “Her2” or “Her2 antibody” when used herein refers to an antibody having an amino acid sequence similar to that for a commercially available Her2 antibody produced in mammalian cells, i.e. CHO cells, known as trastuzumab.

The term “Pichia Her2 antibody” or “Pichia anti-Her2 antibody” when used herein refers to an antibody having an amino acid sequence similar to that for a commercially available Her2 antibody (trastuzumab) produced in glycoengineered Pichia pastoris.

The term “Fc mutein antibody” when used herein refers to an antibody comprising one of the single Fc muteins or the double Fc mutein described herein.

The term “Fc mutein” when used herein refers to an Fc-containing polypeptide in which one or more point mutations have been made to the Fc region.

The term “Fc mutation” when used herein refers to a mutation made to the Fc region of an Fc-containing polypeptide. Examples of such a mutation include the F243A or V264A mutations described herein.

The term “single Fc mutein” when used herein refers to an Fc-containing polypeptide incorporating a mutation at position 243 or 264 of the Fc region. The term “F243A” refers to a mutation from F (wild-type) to A at position 243 of the Fc region of an Fc-containing polypeptide. The term “V264A” refers to a mutation from V (wild-type) to A at position 264 of the Fc region of an Fc-containing polypeptide. The position 243 and 264 represent the amino acid positions in the CH2 domain of the Fc region of an Fc-containing polypeptide.

The term “double Fc mutein” when used herein refers to an Fc-containing polypeptide comprising mutations at positions 243 and 264 of the Fc region. The term “F243A/V264A” refers to a double Fc mutein comprising the two specified mutations. Throughout the present specification and claims, the numbering of the residues in an immunoglobulin heavy chain or an Fc-containing polypeptide is that of the EU index as in Kabat et al., Sequences of Proteins of Immunological Interest, 5th Ed. Public Health Service, National Institutes of Health, Bethesda, Md. (1991), expressly incorporated herein by reference. The “EU index as in Kabat” refers to the residue numbering of the human IgG1 EU antibody.

The term “effector function” as used herein refers to a biochemical event that results from the interaction of an antibody Fc region with an Fc receptor or ligand. Exemplary “effector functions” include Clq binding; complement dependent cytotoxicity; Fc receptor binding; antibody-dependent cell-mediated cytotoxicity (ADCC); phagocytosis; down regulation of cell surface receptors (e. g. B cell receptor; BCR), etc. Such effector functions can be assessed using various assays known in the art.

The term “glycoengineered Pichia pastoris” when used herein refers to a strain of Pichia pastoris that has been genetically altered to express human-like N-glycans. For example, the GFI 5.0, GFI 5.5 and GFI 6.0 strains described above.

The terms “N-glycan”, “glycoprotein” and “glycoform” when used herein refer to an N-linked oligosaccharide, e.g., one that is attached by an asparagine-N-acetylglucosamine linkage to an asparagine residue of a polypeptide. Predominant sugars found on glycoproteins are glucose, galactose, mannose, fucose, N-acetylgalactosamine (GalNAc), N-acetylglucosamine (GlcNAc) and sialic acid (SA, including NANA, NGNA and derivatives and analogs thereof, including acetylated NANA or acetylated NGNA). In glycoengineered Pichia pastoris, sialic acid is exclusively N-acetyl-neuraminic acid (NANA) (Hamilton et al., Science 313 (5792): 1441-1443 (2006)). N-glycans have a common pentasaccharide core of Man₃GlcNAc₂, wherein “Man” refers to mannose, “Glc” refers to glucose, “NAc” refers to N-acetyl, and GlcNAc refers to N-acetylglucosamine. N-glycans differ with respect to the number of branches (antennae) comprising peripheral sugars (e.g., GlcNAc, galactose, fucose and sialic acid) that are added to the Man₃GlcNAc₂ (“Man3”) core structure which is also referred to as the “trimannose core”, the “pentasaccharide core” or the “paucimannose core”. N-glycans are classified according to their branched constituents (e.g., high mannose, complex or hybrid).

As used herein, the term “sialic acid” or “SA” refers to any member of the sialic acid family, including without limitation: N-acetylneuraminic acid (Neu5Ac or NANA), N-glycolylneuraminic acid (NGNA) and any analog or derivative thereof (including those arising from acetylation at any position on the sialic acid molecule). Sialic acid is a generic name for a group of about 30 naturally occurring acidic carbohydrates that are essential components of a large number of glycoconjugates. Schauer, Biochem. Society Transactions, 11, 270-271 (1983). Sialic acids are usually the terminal residue of the oligosaccharides. N-acetylneuraminic acid (NANA) is the most common sialic acid form and N-glycolylneuraminic acid (NGNA) is the second most common form. Schauer, Glycobiology, 1, 449-452 (1991). NGNA is widespread throughout the animal kingdom and, according to species and tissue, often constitutes a significant proportion of the glycoconjugate-bound sialic acid. Certain species such as chicken and man are exceptional, since they lack NGNA in normal tissues. Corfield, et al., Cell Biology Monographs, 10, 5-50 (1982). In human serum samples, the percentage of sialic acid in the form of NGNA is reported to be 0.01% of the total sialic acid. Schauer, “Sialic Acids as Antigenic Determinants of Complex Carbohydrates”, found in The Molecular Immunology of Complex Carbohydrates, (Plenum Press, New York, 1988).

The term “human-like N-glycan”, as used herein, refers to the N-linked oligosaccharides which closely resemble the oligosaccharides produced by non-engineered, wild-type human cells. For example, wild-type Pichia pastoris and other lower eukaryotic cells typically produce hypermannosylated proteins at N-glycosylation sites. The host cells described herein produce glycoproteins (for example, antibodies) comprising human-like N-glycans that are not hypermannosylated. In some embodiments, the host cells of the present invention are capable of producing human-like N-glycans with hybrid and/or complex N-glycans. The specific type of “human-like” glycans present on a specific glycoprotein produced from a host cell of the invention will depend upon the specific glycoengineering steps that are performed in the host cell.

The term “high mannose” type N-glycan when used herein refers to an N-glycan having five or more mannose residues.

The term “complex” type N-glycan when used herein refers to an N-glycan having at least one GlcNAc attached to the 1,3 mannose arm and at least one GlcNAc attached to the 1,6 mannose arm of a “trimannose” core. Complex N-glycans may also have galactose (“Gal”) or N-acetylgalactosamine (“GalNAc”) residues that are optionally modified with sialic acid or derivatives (e.g., “NANA” or “NeuAc”, where “Neu” refers to neuraminic acid and “Ac” refers to acetyl). Complex N-glycans may also have intrachain substitutions comprising “bisecting” GlcNAc and core fucose (“Fuc”). As an example, when a N-glycan comprises a bisecting GlcNAc on the trimannose core, the structure can be represented as Man₃GlcNAc₂(GlcNAc) or Man₃GlcNAc₃. When an N-glycan comprises a core fucose attached to the trimannose core, the structure may be represented as Man₃GlcNAc₂(Fuc). Complex N-glycans may also have multiple antennae on the “trimannose core,” often referred to as “multiple antennary glycans.”

The term “hybrid” N-glycan when used herein refers to an N-glycan having at least one GlcNAc on the terminal of the 1,3 mannose arm of the trimannose core and zero or more than one mannose on the 1,6 mannose arm of the trimannose core.

When referring to “mole percent” of a glycan present in a preparation of a glycoprotein, the term means the molar percent of a particular glycan present in the pool of N-linked oligosaccharides released when the protein preparation is treated with PNGase and then quantified by a method that is not affected by glycoform composition, (for instance, labeling a PNGase released glycan pool with a fluorescent tag such as 2-aminobenzamide and then separating by high performance liquid chromatography or capillary electrophoresis and then quantifying glycans by fluorescence intensity). For example, 50 mole percent NANA₂ Gal₂GlcNAc₂Man₃GlcNAc₂ means that 50 percent of the released glycans are NANA₂ Gal₂GlcNAc₂Man₃GlcNAc₂ and the remaining 50 percent are comprised of other N-linked oligosaccharides.

The term “anti-inflammatory antibody” as used herein, refers to an antibody intended to be used to treat inflammation. The anti-inflammatory properties of an Fc-containing polypeptide can be measured using any method known in the art. In one embodiment, the anti-inflammatory properties of an Fc-containing polypeptide are measured using an animal model, such as the models described in Kaneko et al., Science 313:670-673 (2006), Anthony et al., Science 320:373-376 (2008), and Examples 20-21 herein. In another embodiment, the anti-inflammatory properties of an Fc-containing polypeptide are measured by determining the level of a biomarker related to inflammation (including without limitation: CRP, pro-inflammatory cytokines such as tumor necrosis factors (TNF-alpha), interferon-gamma, interleukin 6 (IL-6, IL-8, IL-10, chemokines, the coagulation marker D-dimer, sCD14, intestinal fatty acid binding peptide (IFABP), and hyaluronic acid. In one embodiment, the anti-inflammatory properties of an Fc-containing polypeptide is measured by determining the level of C-reactive protein (CRP) using a method known in the art. A decrease in the level of C-reactive protein indicates that the Fc-containing polypeptide has anti-inflammatory properties.

“Conservatively modified variants” or “conservative substitution” refers to substitutions of amino acids in a protein with other amino acids having similar characteristics (e.g. charge, side-chain size, hydrophobicity/hydrophilicity, backbone conformation and rigidity, etc.), such that the changes can frequently be made without altering the biological activity of the protein. Those of skill in this art recognize that, in general, single amino acid substitutions in non-essential regions of a polypeptide do not substantially alter biological activity (see, e.g., Watson et al. (1987) Molecular Biology of the Gene, The Benjamin/Cummings Pub. Co., p. 224 (4th Ed.)). In addition, substitutions of structurally or functionally similar amino acids are less likely to disrupt biological activity. Exemplary conservative substitutions are listed below:

Original residue Conservative substitution Ala (A) Gly; Ser Arg (R) Lys; His Asn (N) Gln; His Asp (D) Glu; Asn Cys (C) Ser; Ala Gln (Q) Asn Glu (E) Asp; Gln Gly (G) Ala His (H) Asn; Gln Ile (I) Leu; Val Leu (L) Ile; Val Lys (K) Arg; His Met (M) Leu; Ile; Tyr Phe (F) Tyr; Met; Leu Pro (P) Ala Ser (S) Thr Thr (T) Ser Trp (W) Tyr; Phe Tyr (Y) Trp; Phe Val (V) Ile; Leu

Glycosylation of immunoglobulin G (IgG) in the Fc region, Asn297 (according to the EU numbering system), has been shown to be a requirement for optimal recognition and activation of effector pathways including antibody dependent cellular cytotoxicity (ADCC) and complement dependent cytotoxicity (CDC), Wright & Morrison, Trends in Biotechnology, 15: 26-31 (1997), Tao & Morrison, J. Immunol., 143(8):2595-2601 (1989). As such, glycosylation engineering in the constant region of IgG has become an area of active research for the development of therapeutic monoclonal antibodies (mAbs). It has been established that the presence of N-linked glycosylation at Asn297 is critical for mAb activity in immune effector function assays including ADCC, Rothman (1989), Lifely et al., Glycobiology, 5:813-822 (1995), Umana (1999), Shields (2002), and Shinkawa (2003), and complement dependent cytotoxicity (CDC), Hodoniczky et al., Biotechnol. Prog., 21(6): 1644-1652 (2005), and Jefferis et al., Chem. Immunol., 65: 111-128 (1997). This effect on function has been attributed to the specific conformation adopted by the glycosylated Fc domain, which appears to be lacking when glycosylation is absent. More specifically, IgG which lacks glycosylation in the Fc C_(H)2 domain does not bind to FcγR, including FcγRI, FcγRII, and FcγRIII, Rothman (1989).

Not only does the presence of glycosylation appear to play a role in the effector function of an antibody, the particular composition of the N-linked oligosaccharide is also important. For example, the presence of fucose shows a marked effect on in vitro FcγRIIIa binding and in vitro ADCC, Rothman (1989), and Li et al., Nat. Biotechnol. 24(2): 2100-215 (2006). Recombinant antibodies produced by mammalian cell culture, such as CHO or NS0, contain N-linked oligosaccharides that are predominately fucosylated, Hossler et al., Biotechnology and Bioengineering, 95(5):946-960 (2006), Umana (1999), and Jefferis et al., Biotechnol. Prog. 21:11-16 (2005). Additionally, there is evidence that sialylation in the Fc region may impart anti-inflammatory properties to antibodies. Intravenous immunoglobulin (IVIG) purified over a lectin column to enrich for the sialylated form showed a distinct anti-inflammatory effect limited to the sialylated Fc fragment and was linked to an increase in expression of the inhibitory receptor FcγRIIb, Nimmerjahn and Ravetch., J. Exp. Med. 204:11-15 (2007).

Glycosylation in the Fc region of an antibody derived from mammalian cell lines typically consists of a heterogeneous mix of glycoforms, with the predominant forms typically being comprised of the complex fucosylated glycoforms: G0F, G1F, and, to a lesser extent, G2F. Possible conditions resulting in incomplete galactose transfer to the G0F structure include, but are not limited to, non-optimized galactose transfer machinery, such as β-1,4 galactosyl transferase, and poor UDP-galactose transport into the Golgi apparatus, suboptimal cell culture and protein expression conditions, and steric hindrance by amino acid residues neighboring the oligosaccharide. While each of these conditions may modulate the ultimate degree of terminal galactose, it is thought that subsequent sialic acid transfer to the Fc oligosaccharide is inhibited by the closed pocket configuration of the C_(H)2 domain. See, for example, FIG. 1, Jefferis, R., Nature Biotech., 24 (10): 1230-1231, 2006. Without the correct terminal monosaccharide, specifically galactose, or with insufficient terminal galactosylated forms, there is little possibility of producing a sialylated form, capable of acting as a therapeutic protein, even when produced in the presence of sialyl transferase. Protein engineering and structural analysis of human IgG-Fc glycoforms has shown that glycosylation profiles are affected by Fc conformation, such as the finding that increased levels of galactose and sialic acid on oligosaccharides derived from CHO-produced IgG3 could be achieved when specific amino acids from the Fc pocket were mutated, to an alanine including F241, F243, V264, D265 and R301. Lund et al., J. Immunol. 157(11); 4963-4969 (1996). It was further shown that certain mutations had some effect on cell mediated superoxide generation and complement mediated red cell lysis, which are used as surrogate markers for FcγRI and Clq binding, respectively.

It has been reported that yeast have been genetically engineered to produce host strains capable of secreting glycoproteins with highly uniform glycosylation. Choi et al., PNAS, USA 100(9): 5022-5027 (2003) describes the use of libraries of α1,2 mannosidase catalytic domains and N-acetylglucosaminyltransferase I catalytic domains in combination with a library of fungal type II membrane protein leader sequences to localize the catalytic domains to the secretory pathway. In this way, strains were isolated that produced in vivo glycoproteins with uniform Man₅GlcNAc₂ or GlcNAcMan₅GlcNAc₂ N-glycan structures. Hamilton et al., Science 313 (5792): 1441-1443 (2006) described the production of a glycoprotein, erythropoietin, produced in Pichia pastoris, as having a glycan composition that consisted predominantly of a bisialylated glycan structure, GS6.0, NANA₂Gal₂GlcNAc₂Man₃GlcNAc₂ (90.5%) and monosialylated, GS5.5, NANAGal₂GlcNAc₂ Man₃GlcNAc₂ (7.9%). However, an antibody produced in a similar strain will have a markedly lower content of sialylated N-glycan due to the relatively low level of terminal galactose substrate in the antibody as seen in FIG. 4. It has also recently been shown that sialylation of a Fc oligosaccharide imparts anti-inflammatory properties on therapeutic intravenous gamma globulin and its Fc fragments, Kaneko et al., Science 313(5787): 670-673 (2006), and that the anti-inflammatory activity is dependent on the α2,6-linked form, but not the α2,3 form, of sialic acid, Anthony et al., Science, 320: 373-376 (2008).

Host Organisms and Cell Lines

The Fc-containing polypeptides of this invention can be made in any host organism or cell line. In one embodiment, an Fc-containing polypeptide of the invention is made in a host cell which is capable of producing sialylated N-glycans.

In one embodiment, an Fc-containing polypeptide of the invention is made in a mammalian cell where the cell either endogenously or through genetic or process manipulation produces glycoproteins containing either a mixture of terminal α2-6 and α2-3 sialic acid, or only terminal α2-6 sialic acid. The propagation of mammalian cells in culture (tissue culture) has become a routine procedure. Examples of useful mammalian host cell lines are monkey kidney CV1 line transformed by SV40 (COS-7, ATCC CRL 1651); human embryonic kidney line (293 or 293 cells subcloned for growth in suspension culture); baby hamster kidney cells (BHK, ATCC CCL 10); Chinese hamster ovary cells/-DHFR (CHO); mouse sertoli cells (TM4,); monkey kidney cells (CV1 ATCC CCL 70); African green monkey kidney cells (VERO-76, ATCC CRL-1587); human cervical carcinoma cells (HELA, ATCC CCL 2); canine kidney cells (MDCK, ATCC CCL 34); buffalo rat liver cells (BRL 3A, ATCC CRL 1442); human lung cells (W138, ATCC CCL 75); human liver cells (Hep G2, HB 8065); mouse mammary tumor (MMT 060562, ATCC CCL51); TRI cells; MRC 5 cells; FS4 cells; hybridoma cell lines; NSO; SP2/0;and a human hepatoma line (Hep G2).

In one embodiment, an Fc-containing polypeptide of the invention can be made in a plant cell which is engineered to produce sialylated N-glycans. See, e.g., Cox et al., Nature Biotechnology (2006) 24, 1591-1597 (2006) and Castilho et al., J. Biol. Chem. 285(21): 15923-15930 (2010).

In one embodiment, an Fc-containing polypeptide of the invention can be made in an insect cell which is engineered to produce sialylated N-glycans. See, e.g., Harrison and Jarvis, Adv. Virus Res. 68:159-91 (2006).

In one embodiment, an Fc-containing polypeptide of the invention can be made in a bacterial cell which is engineered to produce sialylated N-glycans. See, e.g., Lizak et al., Bioconjugate Chem. 22:488-496 (2011).

In one embodiment, an Fc-containing polypeptide of the invention can be made in a lower eukaryotic host cell or organism. Recent developments allow the production of fully humanized therapeutics in lower eukaryotic host organisms, yeast and filamentous fungi, such as Pichia pastoris, Gerngross et al., U.S. Pat. No. 7,029,872 and U.S. Pat. No. 7,449,308, the disclosures of which are hereby incorporated by reference. See also Jacobs et al., Nature Protocols 4(1):58-70 (2009). Applicants herein have further developed modified Pichia pastoris host organisms and cell lines capable of expressing antibodies comprising two mutations to the amino acids at positions 243 and 264 in the Fc region of the heavy chain. The antibodies having these mutations had increased levels and a more homogeneous composition of the α2,6-linked sialylated N-glycans when compared to a parent antibody. Applicants have also surprisingly found that mutations at amino acids at positions 243 and 264 in the Fc region of the heavy chain resulted in an antibody which had decreased binding to all Fcγ receptors and decreased Clq binding, the former of which is a surrogate for ADCC, which was independent of the increased levels of the α2,6-linked sialic acid. Thus, based on the increased level and more homogeneity of the terminal α2,6-linked sialic acid N-glycan, those of ordinary skill in the art would recognize and appreciate that the materials and methods described herein can be used to produce recombinant glycosylated antibodies in lower eukaryotic cells, such as yeast and filamentous fungi, and, in particular, Pichia pastoris, that have enhanced anti-inflammatory properties when compared to a parent antibody.

Due to the decreased FcγR and Clq binding, the materials and methods described herein can be used to produce recombinant glycosylated antibodies with decreased effector function when compared to a parent antibody. Antibodies so produced in Pichia pastoris by the methods of the invention were produced at high yield, with decreased effector function, and had a predominant species of glycoprotein having a terminal α2,6-linked sialic acid residue as compared to antibodies produced in glycoengineered Pichia pastoris cells lacking the specific Fc mutations or in Pichia pastoris host cells retaining their endogenous glycosylation machinery.

In one embodiment, an Fc-containing polypeptide of the invention is made in a host cell, more preferably a yeast or filamentous fungal host cell, that has been engineered to produce glycoproteins having a predominant N-glycan comprising a terminal sialic acid. In one embodiment of the invention, the predominant N-glycan is the α2,6 linked form of SA₂Gal₂GlcNAc₂Man₃GlcNAc₂, produced in strains glycoengineered with α2,6 sialyl transferase which do not produce any α2,3 linked sialic acid. In other embodiments, the strain will be engineered to express an α2,3 sialyl transferase alone or in combination with an α2,6, sialyl transferase, resulting in α2,3 linked or a combination of α2,6 and α2,3 linked sialic acid as the predominant N-glycans.

The cell lines to be used to make the Fc-containing polypeptides of the invention can be any cell line, in particular cell lines with the capability of producing one or more sialylated glycoproteins. Those of ordinary skill in the art would recognize and appreciate that the materials and methods described herein are not limited to the specific strain of Pichia pastoris provided as an example herein, but could include any Pichia pastoris strain or other yeast or filamentous fungal strains in which N-glycans with one or more terminal galactose, such as Gal₂GlcNAc₂Man₃, are produced. The terminal galactose acts as a substrate for the production of α2,6-linked sialic acid, resulting in the N-glycan structure NANA₂Gal₂GlcNAc₂Man₃GlcNAc₂. Examples of suitable strains are described in U.S. Pat. No. 7,029,872, US 2006-0286637 and Hamilton et al., Science 313 (5792): 1441-1443 (2006), the descriptions of which are incorporated herein as if set forth at length.

In general, lower eukaryotes such as yeast are used for expression of the proteins, particularly glycoproteins because they can be economically cultured, give high yields, and when appropriately modified are capable of suitable glycosylation. Yeast particularly offers established genetics allowing for rapid transformations, tested protein localization strategies and facile gene knock-out techniques. Suitable vectors have expression control sequences, such as promoters, including 3-phosphoglycerate kinase or other glycolytic enzymes, and an origin of replication, termination sequences and the like as desired.

While the invention has been demonstrated herein using the methylotrophic yeast Pichia pastoris, other useful lower eukaryote host cells include Pichia pastoris, Pichia finlandica, Pichia trehalophila, Pichia koclamae, Pichia membranaefaciens, Pichia minuta (Ogataea minuta, Pichia lindneri), Pichia opuntiae, Pichia thermotolerans, Pichia salictaria, Pichia guercuum, Pichia pijperi, Pichia stiptis, Pichia methanolica, Pichia sp., Saccharomyces cerevisiae, Saccharomyces sp., Hansenula polymorpha, Kluyveromyces sp., Kluyveromyces lactis, Candida albicans, Aspergillus nidulans, Aspergillus niger, Aspergillus oryzae, Trichoderma reesei, Chrysosporiumi lucknowense, Fusarium sp., Fusarium gramineum, Fusarium venenatum and Neurospora crassa. Various yeasts, such as K lactis, Pichia pastoris, Pichia methanolica, and Hansenula polymorpha are particularly suitable for cell culture because they are able to grow to high cell densities and secrete large quantities of recombinant protein. Likewise, filamentous fungi, such as Aspergillus niger, Fusarium sp, Neurospora crassa and others can be used to produce glycoproteins of the invention at an industrial scale.

Lower eukaryotes, particularly yeast and filamentous fungi, can be genetically modified so that they express glycoproteins in which the glycosylation pattern is human-like or humanized. As indicated above, the term “human-like N-glycan”, as used herein refers, to the N-linked oligosaccharides which closely resemble the oligosaccharides produced by non-engineered, wild-type human cells. In preferred embodiments of the present invention, the host cells of the present invention are capable of producing human-like glycoproteins with hybrid and/or complex N-glycans; i.e., “human-like N-glycosylation.” The specific “human-like” glycans predominantly present on glycoproteins produced from the host cells of the invention will depend upon the specific engineering steps that are performed. In this manner, glycoprotein compositions can be produced in which a specific desired glycoform is predominant in the composition. Such can be achieved by eliminating selected endogenous glycosylation enzymes and/or genetically engineering the host cells and/or supplying exogenous enzymes to mimic all or part of the mammalian glycosylation pathway as described in U.S. Pat. No. 7,449,308. If desired, additional genetic engineering of the glycosylation can be performed, such that the glycoprotein can be produced with or without core fucosylation. Use of lower eukaryotic host cells is further advantageous in that these cells are able to produce highly homogenous compositions of glycoprotein, such that the predominant glycoform of the glycoprotein may be present as greater than thirty mole percent of the glycoprotein in the composition. In particular aspects, the predominant glycoform may be present in greater than forty mole percent, fifty mole percent, sixty mole percent, seventy mole percent and, most preferably, greater than eighty mole percent of the glycoprotein present in the composition.

Lower eukaryotes, particularly yeast, can be genetically modified so that they express glycoproteins in which the glycosylation pattern is human-like or humanized. Such can be achieved by eliminating selected endogenous glycosylation enzymes and/or supplying exogenous enzymes as described by Gerngross et al., U.S. Pat. No. 7,449,308. For example, a host cell can be selected or engineered to be depleted in α1,6-mannosyl transferase activities, which would otherwise add mannose residues onto the N-glycan on a glycoprotein.

In one embodiment, the host cell further includes an α1,2-mannosidase catalytic domain fused to a cellular targeting signal peptide not normally associated with the catalytic domain and selected to target the α1,2-mannosidase activity to the ER or Golgi apparatus of the host cell. Passage of a recombinant glycoprotein through the ER or Golgi apparatus of the host cell produces a recombinant glycoprotein comprising a Man₅GlcNAc₂ glycoform, for example, a recombinant glycoprotein composition comprising predominantly a Man₅GlcNAc₂ glycoform. For example, U.S. Pat. Nos. 7,029,872 and 7,449,308 and U.S. Published Patent Application No. 2005/0170452 disclose lower eukaryote host cells capable of producing a glycoprotein comprising a Man₅GlcNAc₂ glycoform.

In a further embodiment, the immediately preceding host cell further includes a GlcNAc transferase I (GnT I) catalytic domain fused to a cellular targeting signal peptide not normally associated with the catalytic domain and selected to target GlcNAc transferase I activity to the ER or Golgi apparatus of the host cell. Passage of the recombinant glycoprotein through the ER or Golgi apparatus of the host cell produces a recombinant glycoprotein comprising a GlcNAcMan₅GlcNAc₂ glycoform, for example a recombinant glycoprotein composition comprising predominantly a GlcNAcMan₅GlcNAc₂ glycoform. U.S. Pat. Nos. 7,029,872 and 7,449,308 and U.S. Published Patent Application No. 2005/0170452 disclose lower eukaryote host cells capable of producing a glycoprotein comprising a GlcNAcMan5GlcNAc2 glycoform. The glycoprotein produced in the above cells can be treated in vitro with a hexosaminidase to produce a recombinant glycoprotein comprising a Man₅GlcNAc₂ glycoform.

In a further embodiment, the immediately preceding host cell further includes a mannosidase II catalytic domain fused to a cellular targeting signal peptide not normally associated with the catalytic domain and selected to target mannosidase II activity to the ER or Golgi apparatus of the host cell. Passage of the recombinant glycoprotein through the ER or Golgi apparatus of the host cell produces a recombinant glycoprotein comprising a GlcNAcMan₃GlcNAc₂ glycoform, for example a recombinant glycoprotein composition comprising predominantly a GlcNAcMan₃GlcNAc₂ glycoform. U.S. Pat. No, 7,029,872 and U.S. Published Patent Application No. 2004/0230042 discloses lower eukaryote host cells that express mannosidase II enzymes and are capable of producing glycoproteins having predominantly a GlcNAcMan₃GlcNAc₂ glycoform. The glycoprotein produced in the above cells can be treated in vitro with a hexosaminidase to produce a recombinant glycoprotein comprising a Man₃GlcNAc₂ glycoform.

In a further embodiment, the immediately preceding host cell further includes GlcNAc transferase II (GnT II) catalytic domain fused to a cellular targeting signal peptide not normally associated with the catalytic domain and selected to target GlcNAc transferase II activity to the ER or Golgi apparatus of the host cell. Passage of the recombinant glycoprotein through the ER or Golgi apparatus of the host cell produces a recombinant glycoprotein comprising a GlcNAc₂Man₃GlcNAc₂ glycoform, for example a recombinant glycoprotein composition comprising predominantly a GlcNAc₂Man₃GlcNAc₂ glycoform. U.S. Pat. Nos. 7,029,872 and 7,449,308 and U.S. Published Patent Application No. 2005/0170452 disclose lower eukaryote host cells capable of producing a glycoprotein comprising a GlcNAc₂Man₃GlcNAc₂ glycoform. The glycoprotein produced in the above cells can be treated in vitro with a hexosaminidase to produce a recombinant glycoprotein comprising a Man₃GlcNAc₂ glycoform.

In a further embodiment, the immediately preceding host cell further includes a galactosyltransferase catalytic domain fused to a cellular targeting signal peptide not normally associated with the catalytic domain and selected to target galactosyltransferase activity to the ER or Golgi apparatus of the host cell. Passage of the recombinant glycoprotein through the ER or Golgi apparatus of the host cell produces a recombinant glycoprotein comprising a GalGlcNAc₂ Man₃GlcNAc₂ or Gal₂GlcNAc₂Man₃GlcNAc₂ glycoform, or mixture thereof for example a recombinant glycoprotein composition comprising predominantly a GalGlcNAc₂ Man₃GlcNAc₂ glycoform or Gal₂GlcNAc₂Man₃GlcNAc₂ glycoform or mixture thereof. U.S. Pat. No. 7,029,872 and U.S. Published Patent Application No. 2006/0040353 discloses lower eukaryote host cells capable of producing a glycoprotein comprising a Gal₂GlcNAc₂ Mani GlcNAc₂ glycoform. The glycoprotein produced in the above cells can be treated in vitro with a galactosidase to produce a recombinant glycoprotein comprising a GlcNAc₂Man₃ GlcNAc₂ glycoform, for example a recombinant glycoprotein composition comprising predominantly a GlcNAc₂Man₃GlcNAc₂ glycoform.

In a further embodiment, the immediately preceding host cell further includes a sialyltransferase catalytic domain fused to a cellular targeting signal peptide not normally associated with the catalytic domain and selected to target sialyltransferase activity to the ER or Golgi apparatus of the host cell. In a preferred embodiment, the sialyltransferase is an alpha2,6-sialyltransferase. Passage of the recombinant glycoprotein through the ER or Golgi apparatus of the host cell produces a recombinant glycoprotein comprising predominantly a NANA₂Gal₂GlcNAc₂Man₃GlcNAc₂ glycoform or NANAGal₂GlcNAc₂Man₃GlcNAc₂ glycoform or mixture thereof. For lower eukaryote host cells such as yeast and filamentous fungi, it is useful that the host cell further include a means for providing CMP-sialic acid for transfer to the N-glycan. U.S. Published Patent Application No. 2005/0260729 discloses a method for genetically engineering lower eukaryotes to have a CMP-sialic acid synthesis pathway and U.S. Published Patent Application No. 2006/0286637 discloses a method for genetically engineering lower eukaryotes to produce sialylated glycoproteins. To enhance the amount of sialylation, it can be advantageous to construct the host cell to include two or more copies of the CMP-sialic acid synthesis pathway or two or more copies of the sialylatransferase. The glycoprotein produced in the above cells can be treated in vitro with a neuraminidase to produce a recombinant glycoprotein comprising predominantly a Gal₂GlcNAc₂Man₃GlcNAc₂ glycoform or GalGlcNAc₂Man₃GlcNAc₂ glycoform or mixture thereof.

Any one of the preceding host cells can further include one or more GlcNAc transferase selected from the group consisting of GnT III, GnT IV, GnT V, GnT VI, and GnT IX to produce glycoproteins having bisected (GnT III) and/or multiantennary (GnT IV, V, VI, and IX) N-glycan structures such as disclosed in U.S. Published Patent Application Nos. 2005/0208617 and 2007/0037248. Further, the proceeding host cells can produce recombinant glycoproteins (for example, antibodies) comprising SA(1-4)Gal(1-4)GlcNAc(2-4) Man₃GlcNAc_(2,) including antibodies comprising NANA (1-4)Gal(1-4)GlcNAc(2-4) Man₃GlcNAc_(2,) NGNA(1-4)Gal(1-4)GlcNAc(2-4)Man₃GlcNAc₂ or a combination of NANA (1-4)Gal(1-4)GlcNAc(2-4) Man₃GlcNAc₂ and NGNA(1-4)Gal(1-4)GlcNAc(2-4) Man₃GlcNAc_(2.) In one embodiment, the recombinant glycoprotein will comprise N-glycans comprising a structure selected from the group consisting of SA(1-4)Gal(1-4)GlcNAc(2-4) Man₃GlcNAc₂ and devoid of any α2-3 linked SA.

In further embodiments, the host cell that produces glycoproteins that have predominantly GlcNAcMan₅GlcNAc₂ N-glycans further includes a galactosyltransferase catalytic domain fused to a cellular targeting signal peptide not normally associated with the catalytic domain and selected to target the galactosyltransferase activity to the ER or Golgi apparatus of the host cell. Passage of the recombinant glycoprotein through the ER or Golgi apparatus of the host cell produces a recombinant glycoprotein comprising predominantly the GalGlcNAcMan₅GlcNAc₂ glycoform.

In a further embodiment, the immediately preceding host cell that produced glycoproteins that have predominantly the GalGlcNAcMan₅GlcNAc₂ N-glycans further includes a sialyltransferase catalytic domain fused to a cellular targeting signal peptide not normally associated with the catalytic domain and selected to target sialyltransferase activity to the ER or Golgi apparatus of the host cell. Passage of the recombinant glycoprotein through the ER or Golgi apparatus of the host cell produces a recombinant glycoprotein comprising a SAGalGlcNAcMan₅GlcNAc₂ glycoform (for example NANAGalGlcNAcMan₅GlcNAc₂ or NGNAGalGlcNAcMan₅GlcNAc₂ or a mixture thereof).

Any of the preceding host cells can further include one or more sugar transporters such as UDP-GlcNAc transporters (for example, Kluyveromyces lactis and Mus musculus UDP-GlcNAc transporters), UDP-galactose transporters (for example, Drosophila melanogaster UDP-galactose transporter), and CMP-sialic acid transporter (for example, human sialic acid transporter). Because lower eukaryote host cells such as yeast and filamentous fungi lack the above transporters, it is preferable that lower eukaryote host cells such as yeast and filamentous fungi be genetically engineered to include the above transporters.

Further, any of the preceding host cells can be further manipulated to increase N-glycan occupancy. See e, g., Gaulitzek et al., Biotechnol. Bioengin. 103:1164-1175 (2009); Jones et al., Biochim. Biospyhs. Acta 1726:121-137 (2005); WO2006/107990. In one embodiment, any of the preceding host cells can be further engineered to comprise at least one nucleic acid molecule encoding a heterologous single-subunit oligosaccharyltransferase (for example, Leishmania sp. STT3A protein, STT3B protein, STT3C protein, STT3D protein or combinations thereof) and a nucleic acid molecule encoding the heterologous glycoprotein, and wherein the host cell expresses the endogenous host cell genes encoding the proteins comprising the endogenous OTase complex. In one embodiment, any of the preceding host cells can be further engineered to comprise at least one nucleic acid molecule encoding a Leishmania sp. STT3D protein and a nucleic acid molecule encoding the heterologous glycoprotein, and wherein the host cell expresses the endogenous host cell genes encoding the proteins comprising the endogenous OTase complex.

Host cells further include lower eukaryote cells (e.g., yeast such as Pichia pastoris) that are genetically engineered to produce glycoproteins that do not have α-mannosidase-resistant N-glycans. This can be achieved by deleting or disrupting one or more of the β-mannosyltransferase genes (e.g., BMT1, BMT2, BMT3, and BMT4) (See, U.S. Published Patent Application No. 2006/0211085) and glycoproteins having phosphomannose residues by deleting or disrupting one or both of the phosphomannosyl transferase genes PNO1 and MNN4B (See for example, U.S. Pat. Nos. 7,198,921 and 7,259,007), which in further aspects can also include deleting or disrupting the MNN4A gene. Disruption includes disrupting the open reading frame encoding the particular enzymes or disrupting expression of the open reading frame or abrogating translation of RNAs encoding one or more of the β-mannosyltransferases and/or phosphomannosyltransferases using interfering RNA, antisense RNA, or the like. Further, cells can produce glycoproteins with α-mannosidase-resistant N-glycans through the addition of chemical hinhibios or through modification of the cell culture condition. These host cells can be further modified as described above to produce particular N-glycan structures.

Host cells further include lower eukaryote cells (e.g., yeast such as Pichia pastoris) that are genetically modified to control O-glycosylation of the glycoprotein by deleting or disrupting one or more of the protein O-mannosyltransferase (Dol-P-Man:Protein (Ser/Thr) Mannosyl Transferase genes) (PMTs) (See U.S. Pat. No. 5,714,377) or grown in the presence of Pmtp inhibitors and/or an α-mannosidase as disclosed in Published International Application No. WO 2007/061631, or both. Disruption includes disrupting the open reading frame encoding the Pmtp or disrupting expression of the open reading frame or abrogating translation of RNAs encoding one or more of the Pmtps using interfering RNA, antisense RNA, or the like. The host cells can further include any one of the aforementioned host cells modified to produce particular N-glycan structures.

Pmtp inhibitors include but are not limited to a benzylidene thiazolidinediones. Examples of benzylidene thiazolidinediones that can be used are 5-[[3,4-bis(phenylmethoxy)phenyl]methylene]-4-oxo-2-thioxo-3-thiazolidineacetic Acid; 5-[[3-(1-Phenylethoxy)-4-(2-phenylethoxy)]phenyl]methylene]-4-oxo-2-thioxo-3-thiazolidineacetic Acid; and 5-[[3-(1-Phenyl-2-hydroxy)ethoxy)-4-(2-phenylethoxy)]phenyl]methylene]-4-oxo-2-thioxo-3-thiazolidineacetic acid.

In particular embodiments, the function or expression of at least one endogenous PMT gene is reduced, disrupted, or deleted. For example, in particular embodiments the function or expression of at least one endogenous PMT gene selected from the group consisting of the PMT1, PMT2, PMT3, and PMT4 genes is reduced, disrupted, or deleted; or the host cells are cultivated in the presence of one or more PMT inhibitors. In further embodiments, the host cells include one or more PMT gene deletions or disruptions and the host cells are cultivated in the presence of one or more Pmtp inhibitors. In particular aspects of these embodiments, the host cells also express a secreted α-1,2-mannosidase.

PMT deletions or disruptions and/or Pmtp inhibitors control O-glycosylation by reducing O-glycosylation occupancy, that is, by reducing the total number of O-glycosylation sites on the glycoprotein that are glycosylated. The further addition of an α-1,2-mannsodase that is secreted by the cell controls O-glycosylation by reducing the mannose chain length of the O-glycans that are on the glycoprotein. Thus, combining PMT deletions or disruptions and/or Pmtp inhibitors with expression of a secreted α-1,2-mannosidase controls O-glycosylation by reducing occupancy and chain length. In particular circumstances, the particular combination of PMT deletions or disruptions, Pmtp inhibitors, and α-1,2-mannosidase is determined empirically as particular heterologous glycoproteins (Fabs and antibodies, for example) may be expressed and transported through the Golgi apparatus with different degrees of efficiency and thus may require a particular combination of PMT deletions or disruptions, Pmtp inhibitors, and α-1,2-mannosidase. In another aspect, genes encoding one or more endogenous mannosyltransferase enzymes are deleted. This deletion(s) can be in combination with providing the secreted α-1,2-mannosidase and/or PMT inhibitors or can be in lieu of providing the secreted α-1,2-mannosidase and/or PMT inhibitors.

Thus, the control of O-glycosylation can be useful for producing particular glycoproteins in the host cells disclosed herein in better total yield or in yield of properly assembled glycoprotein. The reduction or elimination of O-glycosylation appears to have a beneficial effect on the assembly and transport of whole antibodies and Fab fragments as they traverse the secretory pathway and are transported to the cell surface. Thus, in cells in which O-glycosylation is controlled, the yield of properly assembled antibodies or Fab fragments is increased over the yield obtained in host cells in which O-glycosylation is not controlled.

To reduce or eliminate the likelihood of N-glycans and O-glycans with β-linked mannose residues, which are resistant to α-mannosidases, the recombinant glycoengineered Pichia pastoris host cells are genetically engineered to eliminate glycoproteins having α-mannosidase-resistant N-glycans by deleting or disrupting one or more of the β-mannosyltransferase genes (e.g., BMT1, BMT2, BMT3, and BMT4) (See, U.S. Pat. No. 7,465,577 and U.S. Pat. No. 7,713,719). The deletion or disruption of BMT2 and one or more of BMT1, BMT3, and BMT4 also reduces or eliminates detectable cross reactivity to antibodies against host cell protein.

Yield of glycoprotein can in some situations be improved by overexpressing nucleic acid molecules encoding mammalian or human chaperone proteins or replacing the genes encoding one or more endogenous chaperone proteins with nucleic acid molecules encoding one or more mammalian or human chaperone proteins. In addition, the expression of mammalian or human chaperone proteins in the host cell also appears to control O-glycosylation in the cell. Thus, further included are the host cells herein wherein the function of at least one endogenous gene encoding a chaperone protein has been reduced or eliminated, and a vector encoding at least one mammalian or human homolog of the chaperone protein is expressed in the host cell. Also included are host cells in which the endogenous host cell chaperones and the mammalian or human chaperone proteins are expressed. In further aspects, the lower eukaryotic host cell is a yeast or filamentous fungi host cell. Examples of the use of chaperones of host cells in which human chaperone proteins are introduced to improve the yield and reduce or control O-glycosylation of recombinant proteins has been disclosed in Published International Application No. WO 2009105357 and WO2010019487 (the disclosures of which are incorporated herein by reference). Like above, further included are lower eukaryotic host cells wherein, in addition to replacing the genes encoding one or more of the endogenous chaperone proteins with nucleic acid molecules encoding one or more mammalian or human chaperone proteins or overexpressing one or more mammalian or human chaperone proteins as described above, the function or expression of at least one endogenous gene encoding a protein O-mannosyltransferase (PMT) protein is reduced, disrupted, or deleted. In particular embodiments, the function of at least one endogenous PMT gene selected from the group consisting of the PMT1, PMT2, PMT3, and PMT4 genes is reduced, disrupted, or deleted.

In addition, O-glycosylation may have an effect on an antibody or Fab fragment's affinity and/or avidity for an antigen. This can be particularly significant when the ultimate host cell for production of the antibody or Fab is not the same as the host cell that was used for selecting the antibody. For example, O-glycosylation might interfere with an antibody's or Fab fragment's affinity for an antigen, thus an antibody or Fab fragment that might otherwise have high affinity for an antigen might not be identified because O-glycosylation may interfere with the ability of the antibody or Fab fragment to bind the antigen. In other cases, an antibody or Fab fragment that has high avidity for an antigen might not be identified because O-glycosylation interferes with the antibody's or Fab fragment's avidity for the antigen. In the preceding two cases, an antibody or Fab fragment that might be particularly effective when produced in a mammalian cell line might not be identified because the host cells for identifying and selecting the antibody or Fab fragment was of another cell type, for example, a yeast or fungal cell (e.g., a Pichia pastoris host cell). It is well known that O-glycosylation in yeast can be significantly different from O-glycosylation in mammalian cells. This is particularly relevant when comparing wild type yeast O-glycosylation with mucin-type or dystroglycan type O-glycosylation in mammals. In particular cases, O-glycosylation might enhance the antibody or Fab fragments affinity or avidity for an antigen instead of interfere with antigen binding. This effect is undesirable when the production host cell is to be different from the host cell used to identify and select the antibody or Fab fragment (for example, identification and selection is done in yeast and the production host is a mammalian cell) because in the production host the O-glycosylation will no longer be of the type that caused the enhanced affinity or avidity for the antigen. Therefore, controlling O-glycosylation can enable use of the materials and methods herein to identify and select antibodies or Fab fragments with specificity for a particular antigen based upon affinity or avidity of the antibody or Fab fragment for the antigen without identification and selection of the antibody or Fab fragment being influenced by the O-glycosylation system of the host cell. Thus, controlling O-glycosylation further enhances the usefulness of yeast or fungal host cells to identify and select antibodies or Fab fragments that will ultimately be produced in a mammalian cell line.

Those of ordinary skill in the art would further appreciate and understand how to utilize the methods and materials described herein in combination with other Pichia pastoris and yeast cell lines that have been genetically engineered to produce specific N-glycans or sialylated glycoproteins, such as, but, not limited to, the host organisms and cell lines described above that have been genetically engineered to produce specific galactosylated or sialylated forms. See, for example, US 2006-0286637, Production of Sialylated N-Glycans in Lower Eukaryotes, in which the pathway for galactose uptake and utilization as a carbon source has been genetically modified, the description of which is incorporated herein as if set forth at length.

Additionally, the methods herein can be used to produce the above described recombinant Fc-containing polypeptides in other lower eukaryotic cell lines which have been engineered to produce human-like and human glycoproteins that do not have α2,6 sialyltransferase activity. The methods can also be used to produce the above described recombinant Fc-containing polypeptides in eukaryotic cell lines in which production of sialylated N-glycans is an innate feature.

Levels of α2,3 and α2,6 linked sialic acid on the Fc-containing polypeptides can be measured using well known techniques including nuclear magnetic resonance (NMR), normal phase high performance liquid chromatography (HPLC), and high performance anion exchange chromatography with pulsed amperometric detection (HPAEC-PAD).

Biological Properties of Fc muteins

For many Fc-containing polypeptides the lack of or significant decrease in effector function, as shown by decreased FcγR and Clq binding, Idusogie et al., J. Immunology, 164(8): 4178-84 (2000) and Shields et al., J. Biol. Chem., 276: 6591-6604 (2001), and increased anti-inflammatory properties would be desirable characteristics. Applicants herein have discovered that specific modifications of amino acid positions 243 and 264 in the Fc region of an IgG can impart a lack of, or a significant decrease in, effector function irrespective of the presence of sialylation at the terminal glycan positions. Specifically, Applicants have found that modification to residues F243 and V264 in the Fc region to alanine resulted in an antibody with decreased binding to Fcγ receptors and Clq. It is notable that antibodies produced with these Fc region modifications exhibited decreased binding to Fcγ receptors, regardless of whether they were found to have the α2,6-linked sialic acid form as the terminal glycan.

As such, Applicants have developed a double Fc mutein, F243A/V264A, which will produce Fc-containing polypeptides having the aforesaid desired characteristics. The Examples herein comprise transforming a host cell with a polynucleotide vector encoding a Fc-containing polypeptide comprising mutations at positions 243 and 264 of the Fc region, and culturing the transformed host cell to produce the Fc-containing polypeptide.

Production of Fc-Containing Polypeptides

The Fc-containing polypeptides of the invention can be made according to any method known in the art suitable for generating polypeptides comprising a Fc region. In one embodiment, the Fc-containing polypeptide is an antibody or an antibody fragment (including, without limitation a polypeptide consisting of or consisting essentially of the Fc region of an antibody). In another embodiment, the Fc-containing polypeptide is an immunoadhesin. Methods of preparing antibody and antibody fragments are well known in the art. Methods of introducing point mutations into a polypeptide, for example site directed mutagenesis, are also well known in the art.

In the Examples disclosed herein, an IgG1 heavy and light chain containing a consensus C_(H)2 sequence and the Fc double mutants described herein were expressed in two different glycoengineered Pichia pastoris strains. As described in the Examples that follow, the heavy and light chain gene sequences were under the control of a methanol inducible promoter, AOX1, and incorporated a bleomycin (Zeocin) selection marker. This strategy integrates the entire expression cassette into the Trp2 locus by homologous DNA recombination.

Secreted antibodies were captured from the fermentation broth by protein A affinity chromatography followed by a Source 30S cation exchange purification step. Purified antibodies were characterized by SDS-PAGE (FIG. 2) and size exclusion chromatography (SEC) and reverse phase HPLC to assess proper assembly. As seen in FIG. 2, the antibodies produced by the materials and methods herein had a purity profile on SDS-PAGE that was similar to that for a mammalian cell (CHO) produced Her2 antibody. IgG analysis by SEC and reverse phase HPLC further demonstrated that antibodies made from the Fc mutein glycoengineered strains were properly assembled and were similar to the mammalian cell produced antibody in terms of assembly (data not shown). Antigen affinity for the various antibodies made by the materials and methods herein was determined by a cell based assay using a SK-BR3 cell line, which in this instance was a Her2-overexpressing human breast cancer line. As expected, all of the antibodies, including the Fc muteins, bound equally well to the SK-BR3 cell line (FIG. 3).

N-Glycan Analysis of Fc Muteins

For many glycoproteins, including certain antibodies, sialylation of the terminal N-linked glycan of an IgG Fc region is essential for producing glycoproteins and antibodies that have the correct conformation to impart therapeutic activity. See, for example, Anthony et al., Science, 320: 373-376 (2008), where terminal sialylation was correlated to anti-inflammatory activity for an IVIG preparation. Sialylation requires the presence of a penultimate galactose, upon which the sialyl transferase acts to form the sialylated glycan. Thus, glycoproteins lacking one or more terminal galactose glycoforms cannot produce antibodies having the α2,6-linked sialic acid composition associated with anti-inflammatory activity.

Typically, antibodies produced in mammalian cell culture, such as CHO cells, have a glycoform composition comprising: G0F (37%), G1F (43%), G2F (9%), G0 (4%), G1 (3%) and Man5 (3%), which have little or no terminal galactose to act as a substrate for the transfer of sialic acid. In the case of CHO cell production, the terminal glycan produced is the α2,3-linked form; CHO cells do not express an α2,6 sialyl transferase necessary to produce the α2,6-linked form of sialic acid, which has been associated with anti-inflammatory activity. However, overexpression of a specific α2,6 sialyltranferase in CHO can give rise to a mixture of α2,3-linked and α2,6-linked sialic acid (Bragonzi et al., BBA 1474:273-282 (2000); Biochem. Biophys. Res. Comm. 289: 243-249 (2001)). Glycoengineered Pichia pastoris GFI5.0 strains, which are capable of producing high levels of galactosylated non-antibody proteins, such as erythropoietin (Hamilton et al., Science, 313: 1441-1443 (2006)), produce antibodies with relatively low amounts of a terminal galactose that can be acted upon to form the α2,6-linked sialylated form (FIG. 4). Antibodies produced in such Pichia pastoris strains typically have a composition including glycoforms G0 (60%), G1 (17%), G2 (4%) and Man5 (8%). Even antibodies produced in Pichia pastoris GFI6.0 strains, which have a glycan composition comprising G0 (43.5%), G1 (20.8%), G2(2.7%), NANAGalGlcNAcMan₅GlcNAc₂ (5.5%), and NANAGal₂GlcNAc₂Man₃GlcNAc₂ (4.9%), have relatively low levels of the α2,6-linked sialylated form. Thus, antibodies produced in GFI 5.0 and 6.0 strains have much lower levels of galactosylation and sialylation compared to non-antibody proteins (such as erythropoietin) produced in the same strains.

The N-glycan composition of the Her2 antibody and corresponding Fc mutein antibodies produced herein in glycoengineered Pichia pastoris GFI5.0 and GFI6.0 strains were analyzed by matrix-assisted laser desorption ionization/time-of-flight (MALDI-TOF) mass spectrometry after release from the antibody with peptide-N-glycosidase F (FIGS. 4-8). Released carbohydrate composition of the Her2 and the Fc mutein antibodies was quantitated by HPLC on an Allentech Prevail carbo (Alltech Associates, Deerfield Ill.) column.

Glycoforms of the Pichia pastoris Her2 antibody from the GFI5.0 strain included biantennary G0, G1, and G2 and other neutral glycans, with G0 as the dominant glycoform (FIG. 4). This glycan composition is consistent with that produced commercially in CHO cells, with the exception that the Pichia pastoris derived antibody inherently lacks fucose. Conversely, the glycoforms from the Fc mutein antibodies produced in GFI5.0 have dissimilar glycan compositions. The single Fc mutein antibodies, either F243A or V264A, exhibited an increase in galactosylated N-glycans, which can serve as the substrate for the α2,6 sialyl transferase, as seen from the highest peak on MALDI-TOF mass spectrometry (FIGS. 5 and 6), while the N-glycan composition for the Fc double mutein antibody, F243A/V264A, exhibited an even greater increase with over 80% of the total N-glycans galactosylated (FIG. 7). The level of G2 (bi-galactosylated N-glycan) present on the Fc double mutein antibody represented the greatest proportion of G2 seen for any antibody evaluated by Applicants. When these same Fc mutein antibodies were expressed in the GFI6.0 strain, α2,6-linked sialic acid was added to G1 (mono-galactosylated) or G2 (bi-galactosylated) N-glycans. For the single Fc mutein antibody, nearly all of the G2 N-glycan had been converted to a sialylated glycan (data not shown). While antibodies produced from the single Fc muteins exhibited a very high level of α2,6-linked sialylation (40-51%, see Table 3), the level was less than that for the antibodies produced from the Fc double mutein (FIG. 8 and Table 3) where 74% sialylation was achieved with bioreactor fermentation and 91% or greater sialylation was achieved in small scale fermentation.

Without wishing to be bound by any theory, Applicants believe that the sialic acid transfer to the Fc oligosaccharide is enhanced by the more open pocket configuration of the C_(H)2 domain imparted by the Fc double mutein as compared to the Fc single mutein. It should also be noted that the α2,6 form of sialic acid produced from a GFI6.0 strain is the same form produced in humans and differs from the α2,3-linked sialic acid form present on antibodies produced in CHO cell lines, Jassal et al., Biochem. Biophys. Res. Comm. 289: 243-249, 2001.

FcγR Binding of Fc Muteins

Using an ELISA based assay, Applicants compared Fc gamma receptor (FcγR) binding for the Pichia pastoris Her2 antibody, single and double Fc mutein antibodies and the Her2 antibody. As shown in the experiments described in Examples 11 and 15, the Fc double mutein had a decrease in affinity to FcγRI. As FcγRI is a receptor shown to stimulate an immune response upon antibody binding, these data suggest that double mutein antibodies will be less capable of promoting an immune response.

For FcγRIIb, a receptor that has lower antibody affinity as compared to FcγRI and has been shown to inhibit an immune response, the double Fc mutein binds with reduced affinity. For FcγRIIa, the double Fc mutein also appears to bind with reduced affinity. These data suggest that the conformational structure of the double mutein antibodies has been altered such that the ability to inhibit an immune response via FcγRIIa and FcγRIIb/c has been significantly decreased or eliminated.

FcγRIIIa-F158 and FcγRIIIa-V158 are polymorphisms of a receptor known to stimulate an immune response, but have lower antibody affinity as compared to FcγRI. The Fc double mutein had little affinity for FcγRIIIa-F158 while still retaining some affinity for FcγRIIIa-V158. Taken together, these data suggest that the double Fc mutein is less prone to activating and recruiting immune cells such as macrophages, monocytes and natural killer cells as compared to parent antibody.

Clq Binding of Fc Muteins

Antibody-Clq binding is an important parameter for complement dependant cytotoxicity. Binding activity (affinity) of an immunoglobulin (IgG) molecule to Clq may be determined by a cell based assay such as the one provided herein in Example 13. Those of ordinary skill in the art would recognize and appreciate that the disclosed assay can be easily adapted for use with any IgG molecule.

ADCC Effects on Fc Muteins

It is well established that the FcγRIIIa (CD 16) receptor is responsible for antibody-dependent cell-mediated cytotoxicity (ADCC) (Daeron et al., Annu. Rev. Immunol. 15: 203-234, 1997). Applicants have found that antibodies produced from the double Fc mutein described herein have decreased FcγRIIIa binding (FIGS. 9C and D; Tables 4 and 5) and, as such, have likely lost the ability to effect FcγRIIIa-mediated ADCC.

Example 13 provides an in vitro assay for measuring B-cell depletion and fluorescence released ADCC.

Bioavailability of Fc Muteins

Bioavailability refers to the extent to and rate at which an active moiety, whether it be a drug or metabolite, enters human circulation and thereby accessing the site of action. Bioavailability of a drug is mainly affected by the properties of the dosage form as opposed to the drug's physiochemical properties, which in turn can determine its absorption potential. Chemical equivalence suggests that the drug products contain the same active ingredient(s) and in the same amount, although other inactives may differ. Similarly, bioequivalence suggests that the two drug products, when given to the same patient in the same dosing regimen, will produce equivalent concentrations of drug in circulation and tissues. Conversely, two drug products that are not identical may be capable of producing the same therapeutic effect (and adverse effects) when given to the same patient. Thus, the bioavailability of a drug is relative to a determination of any equivalence in that it may be possible to achieve therapeutic equivalence even when bioavailabilities differ. For drugs having a narrow therapeutic index, i.e. the ratio of the minimum toxic concentration to the median effective concentration, bioavailability differences may result in therapeutic nonequivalence.

Applicants have surprisingly found that the Fc double mutein antibodies produced in Pichia pastoris by the materials and methods herein, when injected subcutaneously, had better bioavailability (absorption or exposure) than a comparable antibody produced in CHO cells by known commercial methods. In general, subcutaneous administration is preferable versus intravenous administration in that a subcutaneous formulation may be self-administered by the patient. As shown in FIG. 12, the serum concentrations from mice treated (as set forth in Example 14) with an Fc double mutein antibody increased about 30% as compared to serum concentrations for a CHO produced counterpart and was greater than that for an antibody produced in Pichia pastoris lacking the increased α2,6-linked sialylated form.

Production of Human Glycosylated Antibodies having Increased Levels of Sialylation

As a result of the findings herein, Applicants have developed a method of producing antibodies in that have increased α2,6-linked sialylation through the modification of the Fc region of the antibody such that a strain is created that can produce in vivo antibodies that have increased galactosylation and sialylation at position Asn297. Without wishing to be bound by any theory, Applicants propose that the lack of sialic acid and the low level of galactose present on the N-glycan at position Asn 297 of an antibody is due, not to a low efficiency of the respective glycosyl transferase, but rather to the steric hindrance inherent in the structure of the Fc region. Applicants believe that the structure of the Fc region prevents the addition of galactose and sialic acid during the short period of time when the antibody passes through the secretory pathway. Previous reports have suggested that high levels of galactosylation of a CD20 mAb was possible in vitro when longer incubation times than would typically be used in vivo are used in conjunction with galactosyltransferase Li et al., Nat. Biotechnol. 24(2): 210-215 (2006). It was thought that galactose transfer occurred when the antibody was in an open configuration with less steric hindrance. Structural or conformational changes resulting from the double mutation, i.e. double Fc mutein, result in a permanently open conformation allowing for greatly increased galactose and sialic acid transfer.

From Applicants studies herein, it appears that the individual mutation of amino acid F243 or V264 had a similar impact on increasing galactosylation and sialylation of the Fc region of an IgG1 molecule. Lund et al., J. Immunology 157(11): 4963-4969 (1996) reported a moderate increase of sialylated IgG3 produced in a CHO-K1 cell line by altering single amino acids in the Fc region, Phe241, Phe243, Val264, Aps265 or Tyr296 resulting in levels of 12-42% monosialylated and 4-31% bisialylated form. As reported herein, the antibodies produced by the materials and methods herein had a significant increase in sialylation when the specific sites, F243 or V264, were altered to alanine. Moreover, α2,6-sialylated species levels in excess of 91% were achieved when both sites were simultaneously mutated (Table 3).

Biological Targets

It should be noted that while, in the examples that follow, Applicants exemplify the materials and methods of the invention using IgG1 antibodies having sequences similar to those for commercially available anti-Her2 and anti-TNF antibodies, the invention is not limited to the disclosed antibodies. Those of ordinary skill in the art would recognize and appreciate that the materials and methods herein could be used to produce any Fc-containing polypeptide for which the characteristics of enhanced anti-inflammatory activity or decreased effector function would be desirable. It should further be noted that there is no restriction as to the type of Fc-containing polypeptide or antibody so produced by the invention. The Fc region of the Fc-containing polypeptide could be from an IgA, IgD, IgE, IgG or IgM. In one embodiment, the Fc region of the Fc-containing polypeptide is from an IgG, including IgG1, IgG2, IgG3 or IgG4. In one embodiment, Fc region of the Fc-containing polypeptide is from an IgG1. In specific embodiments the antibodies or antibody fragments produced by the materials and methods herein can be humanized, chimeric or human antibodies.

In some embodiments, the Fc-containing polypeptides of the invention will bind to a biological target that is involved in inflammation.

In some embodiments, the Fc-containing polypeptide of the invention will bind to a pro-inflammatory cytokine. In some embodiments, the Fc-containing polypeptide of the invention will bind to a molecule selected from the group consisting of: TNF-α, IL-1, IL-2, IL-4, IL-5, IL-6, IL-8, IL-9, IL-10, IL-12, IL-15, IL-17, IL-18, IL-20, IL-21, IL-22, IL-23, IL-23R, IL-25, IL-27, IL-33, CD2, CD4, CD11A, CD14, CD18, CD19, CD23, CD25, CD40, CD40L, CD20, CD52, CD64, CD80, CD147, CD200, CD200R, TSLP, TSLPR, PD-1, PDL1, CTLA4, VLA-4, VEGF, PCSK9, α4β7-integrin, E-selectin, Fact II, ICAM-3, beta2-integrin, IFNγ, C5, CBL, LCAT, CR3, MDL-1, GITR, ADDL, CGRP, TRKA, IGF1R, RANKL, GTC, αBLys, or the receptor for any of the above mentioned molecules. In one embodiment, the Fc-containing polypeptide of the invention will bind to TNF-α. In another embodiment, the Fc-containing polypeptide of the invention will bind to Her2. In another embodiment, the Fc-containing polypeptide of the invention will bind to PCSK9. In another embodiment, the Fc-containing polypeptide of the invention will bind to TNFR. In another embodiment, the Fc-containing polypeptide of the invention will bind to LCAT. In another embodiment, the Fc-containing polypeptide of the invention will bind to TSLP. In another embodiment, the Fc-containing polypeptide of the invention will bind to PD-1. In another embodiment, the Fc-containing polypeptide of the invention will bind to IL-23.

In some embodiments, the Fc-containing polypeptides of the invention will be specific for an antigen selected from autoimmune antigens, allergens, MHC molecules or Rhesus factor D antigen. See, e.g., the antigens listed in Table 1 of WO2010/10910, which is incorporated herein by reference.

Methods of Increasing Anti-Inflammatory Properties or Decreasing Effector Function/Cytotoxicity

The invention also comprises a method of increasing the anti-inflammatory properties of an Fc-containing polypeptide comprising: selecting a parent Fc-containing polypeptide that is useful in treating an inflammatory condition (for example, an antibody or immunoadhesin that binds to an antigen that is involved in inflammation) and introducing mutations at positions 243 and 264 of the Fc-containing polypeptide, wherein the numbering is according to the EU index as in Kabat, wherein the Fc-containing polypeptide has increased anti-inflammatory properties when compared to the parent Fc-containing polypeptide. In a embodiment, the Fc-containing polypeptide comprises mutations F243A and V264A. In another embodiment, the Fc-containing polypeptide comprises mutations F243Y and V264G. In another embodiment, the Fc-containing polypeptide comprises mutations F243T and V264G. In another embodiment, the Fc-containing polypeptide comprises mutations F243L and V264A. In another embodiment, the Fc-containing polypeptide comprises mutations F243L and V264N. In another embodiment, the Fc-containing polypeptide comprises mutations F243V and V264G. In one embodiment, the parent Fc-containing polypeptide is an antibody, antibody fragment or immunoadhesin that binds to an antigen that is involved in inflammation. In one embodiment, the parent Fc-containing polypeptide is an an antibody, antibody fragment or immunoadhesin that is already marketed or under development for the treatment of an inflammatory conditions. In another embodiment, the parent Fc-containing polypeptide is an antibody selected from the group consisting of: Muromonab-CD3 (anti-CD3 receptor antibody), Abciximab (anti-CD41 7E3 antibody), Rituximab (anti-CD20 antibody), Daclizumab (anti-CD25 antibody), Basiliximab (anti-CD25 antibody), Palivizumab (anti-RSV (respiratory syncytial virus) antibody), Infliximab (anti-TNFα antibody), Trastuzumab (anti-Her2 antibody), Gemtuzumab ozogamicin (anti-CD33 antibody), Alemtuzumab (anti-CD52 antibody), Ibritumomab tiuxeten (anti-CD20 antibody), Adalimumab (anti-TNFα antibody), Omalizumab (anti-IgE antibody), Tositumomab-131I (iodinated derivative of an anti-CD20 antibody), Efalizumab (anti-CD11a antibody), Cetuximab (anti-EGF receptor antibody), Golimumab (anti-TNFα antibody), Bevacizumab (anti VEGF-A antibody), Natalizumab (anti α4 integrin), Efalizumab (anti CD11a), Cetolizumab (anti-TNFα antibody), Tocilizumab (anti-IL-6R), Ustenkinumab (anti IL-12/23), alemtuzumab (anti CD52), and natalizumab (anti α4 integrin), and variants thereof. In another embodiment, the parent Fc-containing polypeptide is an Fc-fusion protein selected from the group consisting of: Arcalyst/rilonacept (IL1R-Fc fusion), Orencia/abatacept (CTLA-4-Fc fusion), Amevive/alefacept (LFA-3-Fc fusion), Anakinra-Fc fusion (IL-1Ra-Fc fusion protein), etanercept (TNFR-Fc fusion protein), FGF-21-Fc fusion protein, GLP-1-Fc fusion protein, RAGE-Fc fusion protein, ActRIIA-Fc fusion protein, ActRIIB-Fc fusion protein, glucagon-Fc fusion protein, oxyntomodulin-Fc-fusion protein, GM-CSF-Fc fusion protein, EPO-Fc fusion protein, Insulin-Fc fusion protein, proinsulin-Fc fusion protein and insulin precursor-Fc fusion protein, and analogs and variants thereof.

The invention also comprises a method of reducing the effector function of an Fc-containing polypeptide, comprising introducing mutations at positions 243 and 264 of a parent Fc-containing polypeptide, wherein said Fc containing polypeptide has decreased effector function when compared to the parent Fc-containing polypeptide, wherein the numbering is according to the EU index as in Kabat. In one embodiment, the Fc-containing polypeptide comprises mutations F243A and V264A. In one embodiment, the Fc-containing polypeptide is an antibody or antigen binding fragment thereof. In one embodiment, the effector function is ADCC. In another embodiment, the effector function is CDC.

The invention also comprises a method of decreasing cytotoxicity of an Fc-containing polypeptide comprising: selecting a parent Fc-containing polypeptide that is useful in treating an inflammatory condition (for example, an antibody or immunoadhesin that binds to an antigen that is involved in inflammation) that binds to an antigen that is involved in inflammation and introducing mutations at positions 243 and 264 of the Fc-containing polypeptide, wherein the numbering is according to the EU index as in Kabat, wherein the Fc-containing polypeptide has decreased cytotoxicity when compared to the parent Fc-containing polypeptide.

In one embodiment, the parent Fc-containing polypeptide comprises a native Fc region. In another embodiment, the parent Fc-containing polypeptide comprises a F243A mutation. In another embodiment, the parent Fc-containing polypeptide comprises a V264A mutation.

Methods of Treatment

The invention also comprises a method of treating an inflammatory condition in a subject in need thereof comprising: administering to the subject a therapeutically effective amount of an Fc-containing polypeptide comprising mutations at positions 243 and 264, wherein the numbering is according to the EU index as in Kabat. In one embodiment, the Fc-containing polypeptide comprises mutations F243A and V264A. In another embodiment, the Fc-containing polypeptide comprises mutations F243Y and V264G. In another embodiment, the Fc-containing polypeptide comprises mutations F243T and V264G. In another embodiment, the Fc-containing polypeptide comprises mutations F243L and V264A. In another embodiment, the Fc-containing polypeptide comprises mutations F243L and V264N. In another embodiment, the Fc-containing polypeptide comprises mutations F243V and V264G. The Fc-containing polypeptide of the invention can be administered by any route. In one embodiment, the Fc-containing polypeptide is administered parenterally. In one one embodiment, the Fc-containing polypeptide is administered subcutaneously.

In one embodiment, the inflammatory condition is unwanted inflammatory immune reactions.

In one embodiment, the inflammatory condition is an autoimmune disease. In one embodiment, the inflammatory condition will be multiple sclerosis. In one embodiment, the inflammatory condition is systemic lupus erythematosus. In one embodiment, the inflammatory condition is type I diabetes.

In one embodiment, the inflammatory condition is a primary immunodeficiency syndrome, including congential agammaglobulinaemia and hypogammaglobulinaemia, common variable immunodeficiency, severed combined immunodeficiency, or Wiskott Aldrich syndrome.

In one embodiment, the inflammatory condition is a secondary immunodeficiency syndrome, including B-cell lymphocytic leukemia, HIV infection or an allogeneic bone marrow transplantation.

In one embodiment, the inflammatory condition is idiopathic thrombocytopenic purpura.

In one embodiment, the inflammatory condition is multiple myeloma.

In one embodiment, the inflammatory condition is Guillain-Barre syndrome.

In one embodiment, the inflammatory condition is Kawasaki disease.

In one embodiment, the inflammatory condition is chronic inflammatory demyelinating polyneropathy (CIDP).

In one embodiment, the inflammatory condition is autoimmune nuetropenia.

In one embodiment, the inflammatory condition is hemolytic anemia.

In one embodiment, the inflammatory condition is anti-Factor VIII autoimmune disease.

In one embodiment, the inflammatory condition is multifocal neuropathy.

In one embodiment, the inflammatory condition is systemic vasculitis (ANCA positive).

In one embodiment, the inflammatory condition is polymyositis.

In one embodiment, the inflammatory condition is dermatomyositis.

In one embodiment, the inflammatory condition is antiphospholipid syndrome.

In one embodiment, the inflammatory condition is sepsis syndrome.

In one embodiment, the inflammatory condition is graft-v-host disease.

In one embodiment, the inflammatory condition is allergy.

In one embodiment, the inflammatory condition is an anti-Rhesus factor D reaction.

In one embodiment, the inflammatory condition is an inflammatory condition of the cardiovascular system. The Fc-containing polypeptides of the invention may be used to treat atherosclerosis, atherothrombosis, coronary artery hypertension, acute coronary syndrome and heart failure, all of which are associated with inflammation.

In one embodiment, the inflammatory condition is an inflammatory condition of the central nervous system. In another embodiment, the inflammatory condition will be an inflammatory condition of the peripheral nervous system. For example, the Fc-containing polypeptides of the invention may be used for the treatment of e.g., Alzheimer's disease, amyotrophic lateral sclerosis (a.k.a. ALS; Lou Gehrig's disease), ischemic brain injury, prion diseases, and HIV-associated dementia.

In one embodiment, the inflammatory condition is an inflammatory condition of the gastrointestinal tract. For example, the Fc-containing polypeptides of the invention may be used for treating inflammatory bowel disorders, e.g., Crohn's disease, ulcerative colitis, celiac disease, and irritable bowel syndrome.

In one embodiment, the inflammatory condition is psoriasis, atopic dermatitis, arthritis, including rheumatoid arthritis, osteoarthritis, and psoriatic arthritis.

In one embodiment, the inflammatory condition is steroid-dependent atopic dermatitis.

In one embodiment, the inflammatory condition is cachexia.

Examples of other inflammatory disorders that can be treated using the Fc-containing polypeptides of the invention also include: acne vulgaris, asthma, autoimmune diseases, chronic prostatitis, glomerulonephritis, hypersensitivities, pelvic inflammatory disease, reperfusion injury, sarcoidosis, transplant rejection, vasculitis, interstitial cystitis and myopathies.

In one embodiment, the Fc-containing polypeptide of the invention will be administered a dose of between 1 to 100 milligrams per kilograms of body weight. In one embodiment, the Fc-containing polypeptide of the invention will be administered a dose of between 0.001 to 10 milligrams per kilograms of body weight. In one embodiment, the Fc-containing polypeptide of the invention will be administered a dose of between 0.001 to 0.1 milligrams per kilograms of body weight. In one embodiment, the Fc-containing polypeptide of the invention will be administered a dose of between 0.001 to 0.01 milligrams per kilograms of body weight.

Pharmaceutical Formulations

The invention also comprises pharmaceutical formulations comprising an Fc-containing polypeptide of the invention and a pharmaceutically acceptable carrier.

In one embodiment, the invention relates a pharmaceutical composition comprising an Fc-containing polypeptide, wherein at least 70% of the N-glycans on the Fc-containing polypeptide comprise an oligosaccharide structure selected from the group consisting of NANA₍₁₋₄₎Gal₍₁₋₄₎GlcNAc₍₂₋₄₎Man₃GlcNAc_(2,) wherein the Fc-containing polypeptide comprises mutations at amino acid positions 243 and 264 of the Fc region, wherein the numbering is according to the EU index as in Kabat. In one embodiment, the mutations are F243A and V264A. In one embodiment, at least 47 mole % of the N-glycans have the structure NANA₂Gal₂GlcNAc₂Man₃GlcNAc_(2.) In one embodiment, the sialic acid residues in the sialylated N-glycans are attached via an α-2,6 linkage. In one embodiment, the sialic acid residues in the sialylated N-glycans are attached via an α-2,6 linkage and there is no detectable level of an α-2,3 linked sialic acid. In one embodiment, the sialylated N-glycans will comprise no N-glycolylneuraminic acid (NGNA).

As utilized herein, the term “pharmaceutically acceptable” means a non-toxic material that does not interfere with the effectiveness of the biological activity of the active ingredient(s), approved by a regulatory agency of the Federal or a state government or listed in the U.S. Pharmacopoeia or other generally recognized pharmacopoeia for use in animals and, more particularly, in humans. The term “carrier” refers to a diluent, adjuvant, excipient, or vehicle with which the therapeutic is administered and includes, but is not limited to such sterile liquids as water and oils. The characteristics of the carrier will depend on the route of administration.

Pharmaceutical Formulations of therapeutic and diagnostic agents may be prepared by mixing with acceptable carriers, excipients, or stabilizers in the form of, e.g., lyophilized powders, slurries, aqueous solutions or suspensions (see, e.g., Hardman et al. (2001) Goodman and Gilman's The Pharmacological Basis of Therapeutics, McGraw-Hill, New York, N.Y.; Gennaro (2000) Remington: The Science and Practice of Pharmacy, Lippincott, Williams, and Wilkins, New York, N.Y.; Avis, et al. (eds.) (1993) Pharmaceutical Dosage Forms: Parenteral Medications, Marcel Dekker, NY; Lieberman, et al. (eds.) (1990) Pharmaceutical Dosage Forms: Tablets, Marcel Dekker, NY; Lieberman, et al. (eds.) (1990) Pharmaceutical Dosage Forms: Disperse Systems, Marcel Dekker, NY; Weiner and Kotkoskie (2000) Excipient Toxicity and Safety, Marcel Dekker, Inc., New York, N.Y.).

The mode of administration can vary. Suitable routes of administration include oral, rectal, transmucosal, intestinal, parenteral; intramuscular, subcutaneous, intradermal, intramedullary, intrathecal, direct intraventricular, intravenous, intraperitoneal, intranasal, intraocular, inhalation, insufflation, topical, cutaneous, transdermal, or intra-arterial.

In certain embodiments, the Fc-containing polypeptides of the invention can be administered by an invasive route such as by injection (see above). In some embodiments of the invention, the Fc-containing polypeptides of the invention, or pharmaceutical composition thereof, is administered intravenously, subcutaneously, intramuscularly, intraarterially, intra-articularly (e.g. in arthritis joints), intratumorally, or by inhalation, aerosol delivery. Administration by non-invasive routes (e.g., orally; for example, in a pill, capsule or tablet) is also within the scope of the present invention.

In certain embodiments, the the Fc-containing polypeptides of the invention can be administered by an invasive route such as by injection (see above). In some embodiments of the invention, the Fc-containing polypeptides of the invention, or pharmaceutical composition thereof, is administered intravenously, subcutaneously, intramuscularly, intraarterially, intra-articularly (e.g. in arthritis joints), intratumorally, or by inhalation, aerosol delivery. Administration by non-invasive routes (e.g., orally; for example, in a pill, capsule or tablet) is also within the scope of the present invention.

Compositions can be administered with medical devices known in the art. For example, a pharmaceutical composition of the invention can be administered by injection with a hypodermic needle, including, e.g., a prefilled syringe or autoinjector.

The pharmaceutical compositions of the invention may also be administered with a needleless hypodermic injection device; such as the devices disclosed in U.S. Pat. Nos. 6,620,135; 6,096,002; 5,399,163; 5,383,851; 5,312,335; 5,064,413; 4,941,880; 4,790,824 or 4,596,556.

The pharmaceutical compositions of the invention may also be administered by infusion. Examples of well-known implants and modules form administering pharmaceutical compositions include: U.S. Pat. No. 4,487,603, which discloses an implantable micro-infusion pump for dispensing medication at a controlled rate; U.S. Pat. No. 4,447,233, which discloses a medication infusion pump for delivering medication at a precise infusion rate; U.S. Pat. No. 4,447,224, which discloses a variable flow implantable infusion apparatus for continuous drug delivery; U.S. Pat. No. 4,439,196, which discloses an osmotic drug delivery system having multi-chamber compartments. Many other such implants, delivery systems, and modules are well known to those skilled in the art.

Alternately, one may administer the antibody in a local rather than systemic manner, for example, via injection of the antibody directly into an arthritic joint, often in a depot or sustained release formulation. Furthermore, one may administer the antibody in a targeted drug delivery system, for example, in a liposome coated with a tissue-specific antibody, targeting, for example, arthritic joint or pathogen-induced lesion characterized by immunopathology. The liposomes will be targeted to and taken up selectively by the afflicted tissue.

The administration regimen depends on several factors, including the serum or tissue turnover rate of the therapeutic antibody, the level of symptoms, the immunogenicity of the therapeutic antibody, and the accessibility of the target cells in the biological matrix. Preferably, the administration regimen delivers sufficient therapeutic antibody to effect improvement in the target disease state, while simultaneously minimizing undesired side effects. Accordingly, the amount of biologic delivered depends in part on the particular therapeutic antibody and the severity of the condition being treated. Guidance in selecting appropriate doses of therapeutic antibodies is available (see, e.g., Wawrzynczak (1996) Antibody Therapy, Bios Scientific Pub. Ltd, Oxfordshire, UK; Kresina (ed.) (1991) Monoclonal Antibodies, Cytokines and Arthritis, Marcel Dekker, New York, N.Y.; Bach (ed.) (1993) Monoclonal Antibodies and Peptide Therapy in Autoimmune Diseases, Marcel Dekker, New York, N.Y.; Baert, et al. (2003) New Engl. J. Med. 348:601-608; Milgrom et al. (1999) New Engl. J. Med. 341:1966-1973; Slamon et al. (2001) New Engl. J. Med. 344:783-792; Beniaminovitz et al. (2000) New Engl. J. Med. 342:613-619; Ghosh et al. (2003) New Engl. J. Med. 348:24-32; Lipsky et al. (2000) New Engl. J. Med. 343:1594-1602).

Determination of the appropriate dose is made by the clinician, e.g., using parameters or factors known or suspected in the art to affect treatment. Generally, the dose begins with an amount somewhat less than the optimum dose and it is increased by small increments thereafter until the desired or optimum effect is achieved relative to any negative side effects. Important diagnostic measures include those of symptoms of, e.g., the inflammation or level of inflammatory cytokines produced. Preferably, a biologic that will be used is derived from the same species as the animal targeted for treatment, thereby minimizing any immune response to the reagent. In the case of human subjects, for example, chimeric, humanized and fully human Fc-containing polypeptides are preferred.

Fc-containing polypeptides can be provided by continuous infusion, or by doses administered, e.g., daily, 1-7 times per week, weekly, bi-weekly, monthly, bimonthly, quarterly, semiannually, annually etc. Doses may be provided, e.g., intravenously, subcutaneously, topically, orally, nasally, rectally, intramuscular, intracerebrally, intraspinally, or by inhalation. A total weekly dose is generally at least 0.05 μg/kg body weight, more generally at least 0.2 μg/kg, 0.5 μg/kg, 1 μg/kg, 10 μg/kg, 100 μg/kg, 0.25 mg/kg, 1.0 mg/kg, 2.0 mg/kg, 5.0 mg/ml, 10 mg/kg, 25 mg/kg, 50 mg/kg or more (see, e.g., Yang et al., New Engl. J. Med. 349:427-434 (2003); Herold et al., New Engl. J. Med. 346:1692-1698 (2002); Liu et al., J. Neurol. Neurosurg. Psych. 67:451-456 (1999); Portielji et al., Cancer Immunol. Immunother. 52:133-144 (2003). In other embodiments, an Fc-containing polypeptide Of the present invention is administered subcutaneously or intravenously, on a weekly, biweekly, “every 4 weeks,” monthly, bimonthly, or quarterly basis at 10, 20, 50, 80, 100, 200, 500, 1000 or 2500 mg/subject.

As used herein, the terms “therapeutically effective amount”, “therapeutically effective dose” and “effective amount” refer to an amount of an Fc-containing polypeptide of the invention that, when administered alone or in combination with an additional therapeutic agent to a cell, tissue, or subject, is effective to cause a measurable improvement in one or more symptoms of a disease or condition or the progression of such disease or condition. A therapeutically effective dose further refers to that amount of the Fc-containing polypeptide sufficient to result in at least partial amelioration of symptoms, e.g., treatment, healing, prevention or amelioration of the relevant medical condition, or an increase in rate of treatment, healing, prevention or amelioration of such conditions. When applied to an individual active ingredient administered alone, a therapeutically effective dose refers to that ingredient alone. When applied to a combination, a therapeutically effective dose refers to combined amounts of the active ingredients that result in the therapeutic effect, whether administered in combination, serially or simultaneously. An effective amount of a therapeutic will result in an improvement of a diagnostic measure or parameter by at least 10%; usually by at least 20%; preferably at least about 30%; more preferably at least 40%, and most preferably by at least 50%. An effective amount can also result in an improvement in a subjective measure in cases where subjective measures are used to assess disease severity.

EXAMPLE 1 Strains and Reagents

Escherichia coli strains TOP10 or DH5α (Invitrogen, CA) □were used for recombinant DNA work. Restriction endonucleases, DNA modification enzymes and PNGase F were obtained from New England Biolabs, Ipswich, Mass. Oligonucleotides were ordered from Integrated DNA Technologies, Coralville, Iowa.

EXAMPLE 2 Construction of Anti-Her 2 IgG1 Fc Muteins and Pichia Pastoris Recombinant Expression Vector

The preparation of single and double Fc muteins of Her2 IgG1 monoclonal antibody in Pichia pastoris was carried out using the sequences and protocols listed below.

A. Heavy and Light Chains

The heavy and light chain sequences, SEQ ID NOS: 1 and 2, respectively, used for the preparation of the Her2 monoclonal IgG1 antibody are as set forth below. The amino acid sequence of the heavy chain anti-Her2 double mutein antibody is shown in SEQ ID NO:9. The heavy and light chains were codon optimized according to Pichia pastoris codon usage and synthesized by GeneArt AG (Josef-Engert-Str. 11, D-93053 Regensburg, Germany) and cloned into pUC19.

The alanine Fc mutations at amino acid position F243 were carried out using a QuikChange® Site-Directed Mutagenesis Kit (Strategene, CA) using the forward and reverse primers, FcF243A-F (SEQ ID NO: 3) and FcF243A-R (SEQ ID NO: 4), respectively. Similarly, mutations at amino acid position V264 were carried out using the forward and reverse primers, V254A-F (SEQ ID NO: 5) and V264A-R (SEQ ID NO: 6), respectively. The double mutation was carried out through the use of enzymatic digestion between the F243A and V264A sites from each of the single mutein plasmids followed by ligation.

B. Signal Sequence

The signal sequence of an α-Mating Factor predomain was fused in frame to the 5′ end of the light or heavy chain by PCR fusion. The sequence was codon optimized as described above. A Kozak sequence AAACG was added to the 5′ end of the methionine and an EcoR1 site was added before the Kozak sequence for cloning purposes. The DNA sequence (SEQ ID NO: 7) and amino acid (SEQ ID NO: 8) translation are as shown below.

C. Recombinant Plasmids for Expression IgG1 and IgG1 Fc Muteins

The heavy and light chains with the fused signal sequence of IgG1 and its muteins were cloned under Pichia pastoris AOX1 promoter and in front of S. cerevisiae Cyc terminator, respectively. The expression cassette of the completed heavy and light chains was put together into the final expression vector. Genomic insertion into Pichia pastoris was achieved by linearization of the vector with Spe 1 and targeted integration into the Trp2 site.

A summary of the plasmids used herein is given below in Table 1. A graphic representation of the final expression plasmid for the Her2 double Fc mutein is set forth in FIG. 1.

TABLE 1 Plasmid Description pGLY2336 pCR2.1 topo with WT light chain with alpha-MF pre signal sequence and Kozak sequence pGLY2337 pCR2.1 topo with WT heavy chain with alpha-MF pre signal sequence and Kozak sequence pGLY2338 WT light chain expression vector pGLY2987 WT heavy chain expression vector pGLY2988 WT IgG1 expression final vector having both heavy and light chain pGLY3067 pCR2.1 topo vector with IgG1 heavy chain F243A mutation pGLY3473 pCR2.1 topo vector with IgG1 heavy chain V264A mutation pGLY3474 F243A mutein expression vector pGLY3475 V264A mutein expression vector pGLY3479 F243 and V264A double mutein expression vector pGLY3481 pGLY3474(BmHI/NotI) + pGLY2338(BglII/Not) F243A mutant with 1 copy Light chain pGLY3482 pGLY3475(BmHI/NotI) + pGLY2338(BglII/Not) V264A mutant with 1 copy Light chain pGLY3483 F243A and V264A double mutations final expression vector with both heavy and light chain

EXAMPLE 3 Glycoengineered Pichia GFI5.0 and GFI6.0 Hosts for Producing Anti-Her2 and its Fc Muteins

Two different glycoengineered Pichia hosts were applied in this invention, GFI5.0 and GFI 6.0. Following the procedures disclosed in Gerngross, U.S. Pat. No. 7,029,872 and Gerngross, U.S. Pat. No. 7,449,308, one can construct vectors that are useful for genetically engineering lower eukaryotic host cells such that they are capable of expressing a desired polypeptide having a desired N-glycoform as the predominant species. GFI 5.0 and GFI6.0 strains were engineered from NRRL11430 (American Type Culture Collection (ATCC), P.O. Box 1549, Manassas, Va. 20108, USA) according to the methods described in Hamilton et al., Science, 313: 1441-1443 (2006) and Hamilton US 2006/0286637. The engineered Pichia pastoris strain GFI5.0 is capable of producing proteins with a biantennary N-glycan structure with terminal galactose. The genotype of the GFI5.0 strain used herein, RDP697, is as follows: ura5Δ::ScSUC2 och1Δ::lacZ bmt2Δ::lacZ/KlMNN2-2 mnn4L1Δ::lacZ/MmSLC35A3 pno1Δ::lacZ ADE1::lacZ/FB8/NA10/MmSLC35A3 his1::lacZ-URA5-lacZ/XB33/SpGALE/Dm UGT arg1::HIS1/KD53/TC54. The genotype of the engineered Pichia pastoris strain GFI 6.0, YGLY3582, is as follows: ura5Δ::ScSUC2 och1Δ::lacZ, bmt2Δ::lacZ/KlMNN2-2 mnn4L1Δ::lacZ/MmSLC35A3, pno1Δmnn4Δ::lacZ met16Δ::lacZ his1Δ::lacZ/ScGAL10/XB33/DmUGT, arg1Δ::HIS1/KD53/TC54, ADE1::lacZ/NA10/MmSLC35A3/FB8, PRO1::lacZ-URA5-lacZ/TrMDS1, TRP2:ARG1/MmCST/HsGNE/HsCSS/HsSPS/MmST6-33Y. The GFI 6.0 strain is capable of producing proteins with a biantennary N-glycan structure on which terminal α2,6-linked sialic acid is attached to galactose.

The abbreviations used to describe the genotypes are commonly known and understood by those skilled in the art, and include the following abbreviations:

-   ScSUC2 S. cerevisiae Invertase -   OCH1 Alpha-1,6-mannosyltransferase -   KlMNN2-2 K. lactis UDP-GlcNAc transporter -   BMT1 Beta-mannose-transfer (beta-mannose elimination) -   BMT2 Beta-mannose-transfer (beta-mannose elimination) -   BMT3 Beta-mannose-transfer (beta-mannose elimination) -   BMT4 Beta-mannose-transfer (beta-mannose elimination) -   MNN4L1 MNN4-like 1 (charge elimination) -   MmSLC35A3 Mouse homologue of UDP-GlcNAc transporter -   PNO1 Phosphomannosylation of N-glycans (charge elimination) -   MNN4 Mannosyltransferase (charge elimination) -   ScGAL10 UDP-glucose 4-epimerase -   XB33 Truncated HsGalT1 fused to ScKRE2 leader -   DmUGT UDP-Galactose transporter -   KD53 Truncated DmMNSII fused to ScMNN2 leader -   TC54 Truncated RnGNTII fused to ScMNN2 leader -   NA10 Truncated HsGNTI fused to PpSEC12 leader -   FB8 Truncated MmMNS1A fused to ScSEC12 leader -   TrMDS1 Secreted T. reseei MNS1 -   ADE1 N-succinyl-5-aminoimidazole-4-carboxamide ribotide (SAICAR)     synthetase -   MmCST Mouse CMP-sialic acid transporter -   HsGNE Human UDP-GlcNAc 2-epimerase/N-acetylmannosamine kinase -   HsCSS Human CMP-sialic acid synthase -   HsSPS Human N-acetylneuraminate-9-phosphate synthase -   MmST6-33 Truncated Mouse alpha-2,6-sailyl transferase fused to     ScKRE2 leader -   LmSTT3d Catalytic subunit of oligosaccharyltransferase from     Leishmania major

EXAMPLE 4 Yeast Transformation and Screening

The glycoengineered GFI5.0 and GS6.0 strains were grown in YPD rich media (yeast extract 1%, peptone 2% and 2% dextrose), harvested in the logarithmic phase by centrifugation, and washed three times with ice-cold 1 M sorbitol. One to five μg of a Spe1 digested plasmid was mixed with competent yeast cells and electroporated using a Bio-Rad Gene Pulser Xcell™ (Bio-Rad, 2000 Alfred Nobel Drive, Hercules, Calif. 94547) preset Pichia pastoris electroporation program. After one hour in recovery rich media at 24° C., the cells were plated on a minimal dextrose media (1.34% YNB, 0.0004% biotin, 2% dextrose, 1.5% agar) plate containing 300 μg/ml Zeocin and incubated at 24° C. until the transformants appeared.

To screen for high titer strains, 96 transformants were inoculated in buffered glycerol-complex medium (BMGY) and grown for 72 hours followed by a 24 hour induction in buffered methanol-complex medium (BMMY). Secretion of antibody was assessed by a Protein A beads assay as follows. Fifty micro liter supernatant from 96 well plate cultures was diluted 1:1 with 50 mM Tris pH 8.5 in a non-binding 96 well assay plate. For each 96 well plate, 2 ml of magnetic BioMag Protein A suspension beads (Qiagen, Valencia, Calif.) were placed in a tube held in a magnetic rack. After 2-3 minutes when the beads collected to the side of the tube, the buffer was decanted off. The beads were washed three times with a volume of wash buffer equal to the original volume (100 mM Tris, 150 mM NaCl, pH 7.0) and resuspended in the same wash buffer. Twenty μl of beads were added to each well of the assay plate containing diluted samples. The plate was covered, vortexed gently and then incubated at room temperature for 1 hour, while vortexing every 15 minutes. Following incubation, the sample plate was placed on a magnetic plate inducing the beads to collect to one side of each well. On the Biomek NX Liquid Handler (Beckman Coulter, Fullerton, Calif.), the supernatant from the plate was removed to a waste container. The sample plate was then removed from the magnet and the beads were washed with 100 μl wash buffer. The plate was again placed on the magnet before the wash buffer was removed by aspiration. Twenty μl loading buffer (Invitrogen E-PAGE gel loading buffer containing 25 mM NEM (Pierce, Rockford, Ill.)) was added to each well and the plate was vortexed briefly. Following centrifugation at 500 rpm on the Beckman Allegra 6 centrifuge, the samples were incubated at 99° C. for five minutes and then run on an E-PAGE high-throughput pre-cast gel (Invitrogen, Carlsbad, Calif.). Gels were covered with gel staining solution (0.5 g Coomassie G250 Brilliant Blue, 40% MeOH, 7.5% Acetic Acid), heated in a microwave for 35 seconds, and then incubated at room temperature for 30 minutes. The gels were de-stained in distilled water overnight. High titer colonies were selected for further Sixfors fermentation screening described in detail in Example 5. A summary of the IgG1 wild type (parent) and Fc mutein producing strains is given below in Table 2.

TABLE 2 Strains Genotype Description YDX477 ura5Δ::ScSUC2 och1Δ::lacZ bmt2Δ::lacZ/KlMNN2-2 GFI5.0 strain mnn4L1Δ::lacZ/MmSLC35A3 pno1Δ::lacZ producing WT ADE1::lacZ/FB8/NA10/MmSLC35A3 his1::lacZ-URA5- IgG1 lacZ/XB33/SpGALE/DmUGT arg1::HIS1/KD53/TC54 YDX551 ura5Δ::ScSUC2 och1Δ::lacZ bmt2Δ::lacZ/KlMNN2-2 GFI5.0 strain mnn4L1Δ::lacZ/MmSLC35A3 pno1Δ::lacZ producing anti- ADE1::lacZ/FB8/NA10/MmSLC35A3 his1::lacZ-URA5- Her2 Fc V264A lacZ/XB33/SpGALE/DmUGT arg1::HIS1/KD53/TC54 mutein YDX552 ura5Δ::ScSUC2 och1Δ::lacZ bmt2Δ::lacZ/KlMNN2-2 GFI5.0 strain mnn4L1Δ::lacZ/MmSLC35A3 pno1Δ::lacZ producing anti- ADE1::lacZ/FB8/NA10/MmSLC35A3 his1::lacZ-URA5- Her2 Fc F243A lacZ/XB33/SpGALE/DmUGT arg1::HIS1/KD53/TC54 mutein YDX557 ura5Δ::ScSUC2 och1Δ::lacZ bmt2Δ::lacZ/KlMNN2-2 GFI5.0 strain mnn4L1Δ::lacZ/MmSLC35A3 pno1Δ::lacZ producing anti- ADE1::lacZ/FB8/NA10/MmSLC35A3 his1::lacZ-URA5- Her2 Fc F243A, lacZ/XB33/SpGALE/DmUGT arg1::HIS1/KD53/TC54 V264A double mutein YGLY4570 ura5Δ::ScSUC2 och1Δ::lacZ, bmt2Δ::lacZ/KlMNN2-2 GFI6.0 strain mnn4L1Δ::lacZ/MmSLC35A3, pno1Δmnn4Δ::lacZ met16Δ::lacZ, making anti- his1Δ::lacZ/ScGAL10/XB33/DmUGT, arg1Δ::HIS1/KD53/TC54, Her2 Fc V264A ADE1::lacZ/NA10/MmSLC35A3/FB8, PRO1::lacZ-URA5- mutein lacZ/TrMDS1, TRP2:ARG1/MmCST/HsGNE/HsCSS/HsSPS/MmST6-33 YGLY4568 ura5Δ::ScSUC2 och1Δ::lacZ, bmt2Δ::lacZ/KMNN2-2 GFI6.0 strain mnn4L1Δ::lacZ/MmSLC35A3, pno1Δmnn4Δ::lacZ met16Δ::lacZ, making anti- his1Δ::lacZ/ScGAL10/XB33/DmUGT, arg1Δ::HIS1/KD53/TC54, Her2 Fc F243A ADE1::lacZ/NA10/MmSLC35A3/FB8, PRO1::lacZ-URA5- mutein lacZ/TrMDS1, TRP2:ARG1/MmCST/HsGNE/HsCSS/HsSPS/MmST6-33 YGLY4563 ura5Δ::ScSUC2 och1Δ::lacZ, bmt2Δ::lacZ/KlMNN2-2 GFI6.0 strain mnn4L1Δ::lacZ/MmSLC35A3, pno1Δmnn4Δ::lacZ met16Δ::lacZ, making anti- his1Δ::lacZ/ScGAL10/XB33/DmUGT, arg1Δ::HIS1/KD53/TC54, Her2 ADE1::lacZ/NA10/MmSLC35A3/FB8, PRO1::lacZ-URA5- F243A/V264A lacZ/TrMDS1, double mutein TRP2:ARG1/MmCST/HsGNE/HsCSS/HsSPS/MmST6-33

EXAMPLE 5 Bioreactor (Sixfors) Screening

Bioreactor fermentation screening was conducted as described as follows: Fed-batch fermentations of glycoengineered Pichia pastoris were executed in 0.5 liter bioreactors (Sixfors multi-fermentation system, ATR Biotech, Laurel, Md.) under the following conditions: pH 6.5, 24° C., 300 ml airflow/min, and an initial stirrer speed of 550 rpm with an initial working volume of 350 ml (330 ml BMGY medium [100 mM potassium phosphate, 10 g/l yeast extract, 20 g/l peptone (BD, Franklin Lakes, N.J.), 40 g/l glycerol, 18.2 g/l sorbitol, 13.4 g/l YNB (BD, Franklin Lakes, N.J.), 4 mg/1 biotin] and 20 ml inoculum). IRIS multi-fermentor software (ATR Biotech, Laurel, Md.) was used to increase the stirrer speed from 550 rpm to 1200 rpm linearly between hours 1 and 10 of the fermentation. Consequently, the dissolved oxygen concentration was allowed to fluctuate during the fermentation. The fermentation was executed in batch mode until the initial glycerol charge (40 g/l) was consumed (typically 18-24 hours). A second batch phase was initiated by the addition of 17 ml of a glycerol feed solution to the bioreactor (50% [w/w] glycerol, 5 mg/l biotin and 12.5 ml/l PTM1 salts (65 g/l FeSO₄.7H₂O, 20 g/l ZnCl₂, 9 g/l H₂SO₄, 6 g/l CuSO₄.5H₂O, 5 g/l H₂SO₄, 3 g/l MnSO₄.7H₂O, 500 mg/l CoCl₂.6H₂O, 200 mg/l NaMoO₄.2H₂O, 200 mg/l biotin, 80 mg/l NaI, 20 mg/l H₃BO₄). The fermentation was again operated in batch mode until the added glycerol was consumed (typically 6-8 hours). The induction phase was initiated by feeding a methanol solution (100% [w/w] methanol, 5 mg/l biotin and 12.5 ml/l PTM1 salts) at 0.6 g/hr, typically for 36 hours prior to harvest. The entire volume was removed from the reactor and centrifuged in a Sorvall Evolution RC centrifuge equipped with a SLC-6000 rotor (Thermo Scientific, Milford, Mass.) for 30 minutes at 8,500 rpm. The cell mass was discarded and the supernatant retained for purification and analysis. Glycan quality is assessed by MALDI-Time-of-flight (TOF) spectrometry and 2-aminobenzidine (2-AB) labeling according to Li et al., Nat. Biotech. 24(2): 210-215 (2006). Glycans were released from the antibody by treatment with PNGase-F and analyzed by MALDI-TOF to confirm glycan structures. To quantitated the relative amounts of neutral and charged glycans present, the N-glycosidase F released glycans were labeled with 2-AB and analyzed by HPLC.

EXAMPLE 6 Bioreactor Cultivations

Fermentations were carried out in 3 L (Applikon, Foster City, Calif.) and 15 L (Applikon, Foster City, Calif.) glass bioreactors and a 40 L (Applikon, Foster City, Calif.) stainless steel, steam in place bioreactor. Seed cultures were prepared by inoculating BMGY media directly with frozen stock vials at a 1% volumetric ratio. Seed flasks were incubated at 24° C. for 48 hours to obtain an optical density (OD600) of 20±5 to ensure that cells are growing exponentially upon transfer. The cultivation medium contained 40 g glycerol, 18.2 g sorbitol, 2.3 g K₂HPO₄, 11.9 g KH₂PO₄, 10 g yeast extract (BD, Franklin Lakes, N.J.), 20 g peptone (BD, Franklin Lakes, N.J.), 4×10⁻³ g biotin and 13.4 g Yeast Nitrogen Base (BD, Franklin Lakes, N.J.) per liter. The bioreactor was inoculated with a 10% volumetric ratio of seed to initial media. Cultivations were done in fed-batch mode under the following conditions: temperature set at 24±0.5° C., pH controlled at to 6.5±0.1 with NH₄OH, dissolved oxygen was maintained at 1.7±0.1 mg/L by cascading agitation rate on the addition of O₂. The airflow rate was maintained at 0.7 vvm. After depletion of the initial charge glycerol (40 g/L), a 50% glycerol solution containing 12.5 mL/L of PTM1 salts was fed exponentially at 50% of the maximum growth rate for eight hours until 250 g/L of wet cell weight was reached. Induction was initiated after a thirty minute starvation phase when methanol was fed exponentially to maintain a specific growth rate of 0.01 h⁻¹. When an oxygen uptake rate of 150 mM/L/h was reached, the methanol feed rate was kept constant to avoid oxygen limitation.

EXAMPLE 7 Antibody Purification

Purification of secreted antibody can be performed by one of ordinary skill in the art using available published methods, for example Li et al., Nat. Biotech. 24(2):210-215 (2006), in which antibodies are captured from the fermentation supernatant by Protein A affinity chromatography and further purified using hydrophobic interaction chromatography with a phenyl sepharose fast flow resin.

EXAMPLE 8 MALDI-TOF Analysis of Glycans

N-glycans were analyzed as described in Choi et al., Proc. Natl. Acad. Sci. USA 100: 5022-5027 (2003) and Hamilton et al., Science 301: 1244-1246 (2003). After the glycoproteins were reduced and carboxymethylated, N-glycans were released by treatment with peptide-N-glycosidase F. The released oligosaccharides were recovered after precipitation of the protein with ethanol. Molecular weights were determined by using a Voyager PRO linear MALDI-TOF (Applied Biosystems) mass spectrometer with delayed extraction according to the manufacturer's instructions. The results of the N-glycan analysis of the anti-Her2 antibodies produced according to the Examples above are shown in FIGS. 4-8.

EXAMPLE 9 N-Linked Glycan Analysis by HPLC

To quantify the relative amount of each glycoform, the N-glycosidase F released glycans were labeled with 2-aminobenzidine (2-AB) and analyzed by HPLC as described in Choi et al., Proc. Natl. Acad. Sci. USA 100: 5022-5027 (2003) and Hamilton et al., Science 313: 1441-1443 (2006). The amounts of sialylated anti-Her2 antibody produced in a GFI 6.0 strain for single and double muteins produced in 3 L bioreactors and for wild-type and double mutein produced in a small scale 0.5 L bioreactor is shown in Table 3.

TABLE 3 Mono- sialylated Bi-sialylated Total sialylated Wild-type 10.4%  0% 10.4%  Single mutein V264A 43% 8% 51% Single mutein F243A 23% 7% 30% Double mutein 27% 47%  74% F243A/V264A Double mutein 25% 66%  >91%  F243A/V264A (0.5 L bioreactor)

EXAMPLE 10 Antigen Affinity Assay

Mammalian cells expressing antigen were harvested by trypsinization, filtered through a 40 μm cell strainer, and suspended in 1% fetal bovine serum (FBS) in phosphate buffered saline (PBS) in a 96-deep-well plate. Serial dilutions of the purified antibody were added to the cells at final concentration ranging from 10 to 0.01 μg ml-1. The antibody cell mixture was incubated for 45 minutes on ice. The cells were washed in cold PBS and stained with 2 μg ml-1 of anti-human IgG-AlexaFluor488 (Invitrogen, Carlsbad, Calif.) in 1% FBS in PBS for 45 min on ice in the dark. The cells were washed again in cold PBS, suspended in 1% FBS in PBS and transferred to a U-bottom 96-well plate (USA Scientific, Ocala, Fla.). Mean fluorescence intensity (MFI) was detected on a Guava ExpressPlus (Millipore, Billerica, Mass.) using an excitation wavelength of 488 nm and an emission wavelength of 525 nm. The results are shown in FIG. 3.

EXAMPLE 11 FcγR Binding Assay

Fcγ receptor binding assays were carried out at described in Shields et al., J. Biol. Chem. 276: 6591-6604 (2001) with minor modifications. High protein binding 96-well plates (Corning Costar, Lowell, Mass.) were coated with 100 μl per well of Fcγ receptor solutions in PBS at the following concentrations: 1 μg/mL for FcγRI (R & D Systems) and FcγRIIa (Pichia pastoris produced), 2 μg/mL for FcγRIIb/c (P. pastoris produced), 0.4 μg/mL for FcγRIIIa-V158, and 0.8 μg/mL for FcγRIIIa-F158 (both P. pastoris produced). FcγRIIIa-V 158 and FcγRIIIa-F158 receptors were expressed using P. pastoris as described in Li et al., Nat. Biotech. 24:210-215(2006).

FcγRIIa was also expressed in glycoengineered Pichia using a similar method as described in Li et al. The FcγRIIa extracellular domain was PCR amplified from human cDNA and cloned into pCR2.1 topo vector. The Fc gamma receptors were cloned into Pichia expression vector using S. cerevisiae alpha Mating Factor prepro domain and under AOX1 promoter. The final strain, yGLY4665, was generated by transforming pGLY3249 into yGLY638 (GFI2.0 host).

The FcγRIIb/c was expressed and produced using glycoengineered Pichia YGLY638 (GFI2.0 host). The DNA sequence of the extracellular domain of the human Fc gamma receptor IIb/c (NP_003992) carrying its C-terminal 9 His-tag was Pichia codon optimized, and designated pAS 197 (GeneArt, Germany). The amino acid sequence of the histidine-tagged extracellular domain of the FcγRIIb/c can be found in SEQ ID NO:17. For the plasmid construction of pGLY3246, the codon-optimized hFcγRIIb/c (AfeI/KpnI) and Saccharomyces cerevisiae αMFprepro (EcoRI/blunt) were cloned into pGLY2219 at EcoRI and KpnI sites. The resulting plasmid pGLY3246 was transformed into yGLY638 to generate yGLY4653. YGLY4653 were fermented and purified according to Li et al.

For FcγRI, the antibody was coated in assay diluent (1% BSA, PBS, 0.05% Tween20) in monomeric form. For all other receptors, the antibody was coated after dimerization with alkaline phosphatase conjugated anti-human IgG F(ab′)₂ (Jackson ImmunoResearch, West Grove, Pa.) for one hour at room temperature. FcγRI bound antibody was also detected using the F(ab′)₂ and all plates were quantified by measuring excitation at 340 nm and emission at 465 nm after an 18 hour incubation with SuperPhos (Virolabs, Chantilly, Va.).

The results are shown in FIG. 9. As shown in FIG. 9A, the Fc single muteins (▴ and ▾) had FcγRI (Fc receptor gamma-chain I, CD64) binding similar to both the Her2 antibody (▪) (FIG. 9A) and the Pichia pastoris Her2 (data not shown), while the Fc double mutein (♦) had about a fourteen fold decrease in affinity to FcγRI (FIG. 9A).

For FcγRIIb/c, the Fc single muteins (▴ and ▾) demonstrated a ten fold decrease in receptor binding properties as compared to the Her2 antibody (▪) (FIG. 9B), while the double Fc mutein does not appear to bind to FcγRIIb/c.

FcγRIIIa-F158 and FcγRIIIa-V158, both single Fc muteins (▴ and ▾) bind twenty fold better than the commercial Herceptin antibody (▪) to FcγRIIIa-F158 (FIG. 9C), but bind FcγRIIIa-V 158 only slightly better than the commercial Herceptin antibody (FIG. 9D). The Fc double mutein (♦) had little affinity (50 fold decrease) for FcγRIIIa-F158 (FIG. 9C) while still retaining some affinity for FcγRIIIa-V158, albeit thirty folder weaker than the commercial Herceptin antibody (▪) and the Pichia pastoris Her2 antibody (data not shown) from GS5.0 (FIG. 9D).

Moreover, the affinity of the double Fc mutein for both polymorphisms of FcγRIIIa does not appear to change upon release of the sialic acid by neuraminidase (data not shown). Thus, without wishing to be bound by any theory, Applicants attribute the decrease in affinity for both polymorphisms of FcγRIIIa to structural or conformational changes resulting from the double mutation, i.e. double Fc mutein, and not due to the increased levels of the α2,6-linked sialylated N-glycans.

EXAMPLE 12 Clq Binding Assay for the Anti-Her2 Antibodies and its Fc Muteins

The Clq binding assay was conducted using the methods of Idusogie et al., J. Immunology, 164: 4178-4184 (2000) as described. Serially diluted antibody was coated 100 μl per well in 50 mM Na₂HCO₃ pH9.0 to clear high binding plates. Human Clq complement (US Biological, Swampscott, Mass.) was coated at 2 μg/mL in assay diluent (0.1% Bovine Gelatin, PBS, 0.05% Tween20) for two hours. Clq was detected with HRP conjugated sheep polyclonal anti-human Clq antibody (AbDSerotec) and quantified by measuring OD₄₅₀.

The results are shown in FIG. 10. As shown in FIG. 10, the single and double Fc mutein antibodies produced by the materials and methods described herein had decreased Clq binding relative to those produced in mammalian cell culture or non-sialylated Pichia pastoris strains. Clq binding for the antibodies produced from the single Fc muteins (▴ or ▾) were decreased 5-10 fold relative to the Her2 antibody while Clq binding for the double Fc mutein (♦) was virtually eliminated.

Both the Pichia pastoris Her2 antibody produced in a GFI5.0 strain (data not shown) and the Her2 antibody showed similar affinity to Clq.

EXAMPLE 13 Antibody Dependent Cellular Toxicity for Anti-Her2 and its Fc Muteins

Antibody dependent cellular toxicity (ADCC) was measured using a europium incorporation assay. The human ovarian adenocarcinoma line SKOV3 was cultured in McCoy's 5A media supplemented with 10% fetal bovine sera (FBS). Peripheral blood mononuclear cells (PBMC) were obtained from leucopaks. The PBMCs were subjected to Ficoll-Hypaque density centrifugation, washed in PBS supplemented with 2% FBS, and resuspended in McCoy's 5A media with 10% FBS. The FcγRIIIA F158V genotype was determined for each individual donor. SKOV3 cells were labeled with EuDTPA. The cells were added to 96 well tissue culture plates at 5000/well and effector cells (PBMC) were added at 300,000/well (E:T 60:1). Antibodies were added at different concentrations and diluted across the plate. Controls included background, target and effector baseline counts, and 100% lysis wells. The PBMC mixtures with and without antibody were incubated for four hours at 37° C. Release of EuDTPA from lysed PBMC was determined by mixing 20 μl of the supernatant with DELPHIA Enhancement Solution (Perkin Elmer, cat #1244-105) to form a highly fluorescent chelate, which is measured using time resolved fluorometry. Triplicate wells were set up for each antibody dilution and the percentage of lysis was calculated according to the formula: ((experimental release−background)/(maximal release−background))−((natural cytotoxicity-background)/(maximal release−background)). The terms are defined as follows: experimental release represents the mean count for the target cells in the presence of effector cells and antibody, background represents the mean for the supernatant from the final wash after labeling the target cells, maximal release represents the mean for target cells incubated with DELPHIA lysis buffer (Perkin Elmer, cat #4005-0010) and natural cytotoxicity represents the mean count for the target cells in the presence of effector cells. Data points were fit to a four parameter logistic regression model using Prism 5.0 software. All curves were constrained to share the same maximum, minimum, and slope.

Those of ordinary skill in the art would recognize and appreciate that the assays in Examples 10-12 can be readily adapted for requirements pertaining to any immunoglobulin molecule. Furthermore, an in vivo ADCC assay in an animal model can be adapted for any specific IgG using the methods of Borchmann et al., Blood, 102: 3737-3742 (2003); Niwa et al., Cancer Research, 64: 2127-2133 (2004).

The results are shown in FIG. 11. The single Fc muteins showed an ADCC activity profile similar to that for the Her2 antibody and approximately five fold lower than the Pichia pastoris Her2 antibody produced in a GFI 5.0 host. As illustrated in FIG. 11, ADCC activity is virtually absent for the antibody produced from the double Fc mutein, as expected from the FcγRIIIa binding data.

EXAMPLE 14 Subcutaneous PK Study for Anti-Her2 and its Fc Muteins

The subcutaneous PK study was conducted in C57B6 mice. Antibody samples were administrated subcutaneously at the dose of 1 mg/kg (n=3). Ten μl of blood was collected with a capillary tube at the collection time points of 1, 6, 24, 53, 77, 120, 192, 240, 288 and 360 hours and transferred to a microfuge tube containing 90 μl of calcium and magnesium free PBS and 1.8 mg/ml K₂EDTA. Human IgG levels were determined on a Gyros® Bioaffy (Uppsala, Sweden) workstation using a sandwich immunoassay. 100 μg/ml biotinylated mouse monoclonal, anti-human kappa chain (BD Pharmingen, San Diego, Calif.) was used as the capture antibody and 12.5 nM ALEXA-647 labeled mouse monoclonal, anti-human Fc, Pan IgG (Southern Biotech, Birmingham, Ala.) was used as the detection antibody. The entire immunoassay was automated from capture antibody immobilization and analyte addition, to detection antibody addition and wash steps. Standards and QC were prepared in 5% mouse control plasma (EDTA) as 20× stocks and diluted 1:20 into 5% mouse plasma in assay buffer (PBS, 0.01% Tween) prior to analysis. The linear range for accurate IgG concentration determination was established with spiked QC and found to be 5-5000 ng/ml. Accuracy and precision acceptability limits were +/−20% with a lower limit of quantitation (LLOQ) of +/−25%. Standards and QC could be frozen and thawed three times without significant loss of signal. Standards, QC and study samples were stored at −70° C. Study samples were thawed and diluted 1:20 into 5% mouse plasma in assay buffer and further diluted 1:10 if levels were outside the linear assay range. All standards, QC and study samples were assayed in duplicate and the average results reported. Concentrations were determined using a 5^(th) parameter logistic curve fit. Pharmacokinetic parameters were calculated for each animal with WinNonlin using noncompartmental analysis of serum mAb concentration-time data (WinNonlin Enterprise Version 5.01, Pharsight Corp, Mountain View, Calif.).

As shown in FIG. 12, mice treated with Pichia pastoris Her2 with GFI5.0 glycosylation and Her2 have similar t 1/2 and serum concentrations, while mice treated with the Fc double mutein Her2, produced with GFI6.0 glycosylation, exhibited a higher Cmax (Maximum Concentration) and about a 30% increase in serum concentration as compared to mice treated with Her2 produced in CHO cells. Thus, of the three samples injected subcutaneously, the Fc double mutein antibody exhibited better bioavailability (absorption or exposure) based on the higher Cmax and serum concentrations.

EXAMPLE 15

Another set of Fcγ receptor binding assays for the anti-Her2 antibody of the invention and its Fc muteins were carried out as described in Example 11, and the results are shown in FIG. 13; and Tables 4 and 5.

TABLE 4 Comparison of FcγR Binding Affinity to Her 2 Antibody FcγIIIa FcγIIIa Sample FcγRI FcγRIIa FcγRIIb/c LF LV Her2 Ab 1.0 1.0 1.0 1.0 1.0 Pichia Her 2 Ab 0.6 0.4 0.9 11.3 2.8 F243A/V264A 0.2 0.02 No 0.04 0.4 binding F243A 0.6 0.1 0.3 8.4 3.3 V264A 0.6 0.03 0.2 3.6 1.4

-   Ratio calculation: STD EC50/anti-antigen mAb -   Ratio>1.0 higher affinity than Her2 Ab -   Ratio<1.0 lower affinity than Her 2 Ab

TABLE 5 Comparison of FcγR Binding Affinity to Pichia Her 2 Antibody FcγIIIa FcγIIIa Sample FcγRI FcγRIIa FcγRIIb/c LF LV Pichia Her 2 Ab 1.0 1.0 1.0 1.0 1.0 F243A/V264A 0.5 0.04 No 0.003 0.1 binding F243A 1.0 0.2 0.3 0.74 1.2 V264A 0.9 0.1 0.2 0.3 0.5

-   Ratio calculation: STD EC50/anti-antigen mAb -   Ratio>1.0 higher affinity than Pichia Her2 Ab -   Ratio<1.0 lower affinity than Pichia Her 2 Ab

EXAMPLE 16 ADCC Evaluation of Anti-HER2 Antibodies and Fc Muteins

ADCC analysis was performed using SKOV3 target cells (ATCC, Cat #HTB-77). On the day before the assay, primary NK effector cells (Biological Specialty, Cat #215-11-10) were pelleted at 1000 rpm for 15 minutes and resuspended to 1×10⁶ cells/ml in RPMI minus phenol red media (Invitrogen, catalog #11835-030) supplemented with 10% FBS (Cellgro, Cat #35-016-CV). The resuspended NK cells were incubated overnight at 37° C. under 5% CO₂.

On the day of the assay, a flask of adhered SKOV3 target cells was washed with PBS, and the cells were detached using 3 ml trypsin (Cellgro, Cat #25-053-CI) and incubation for 2-5 minutes at 37° C. The cells were collected with 23 ml RPMI minus phenol red media, 10% FBS and pipetted up and down to break apart clumps. The harvested cells were centrifuged at 1800 rpm for 5 minutes and resuspended to a concentration of 1×10⁷ cells/ml with RPMI minus phenol red media, 10% FBS. The target cells (1×10⁷ cells) were labeled with 100 μCi of Chromium-51 (5 mCi Sodium chromate in normal saline, Perkin Elmer, Cat #NEZ03005MC). Target cells were incubated at 37° C. for one hour with shaking every 15 minutes. Cells were centrifuged at 1800 rpm for 2 minutes and resuspended in one ml RPMI minus phenol red media, 10% FBS. Cells were washed two additional times with one ml RPMI minus phenol red media, 10% FBS with centrifugation at 1800 rpm for 2 minutes between each wash. After the final wash, the labeled target cells were resuspended in RPMI minus phenol red media, 10% FBS to a final concentration of 2.5×10⁵ cells/ml.

Test antibodies used in these assays were anti-HER2 mAb produced in GFI 5.0, anti-HER2 mAb F243A produced in GFI 6.0 (GS6.0/F243A), anti-HER2 mAb V264A produced in GFI 6.0 (GS6.0/V264A), and anti-HER2 mAb F243A/V264A produced in GFI 6.0 (GS6.0/F243A/V264A). While the SKOV3 target cells were being labeled, test antibodies were diluted using a 3-fold serial titration (starting at 1 μg/ml) in RPMI minus phenol red media, 10% FBS in a polystyrene 96-well plate (Costar, Cat #353077). To the wells of a separate 96-well assay plate, 100 μl of Cr-51 labeled SKOV3 target cells (=25,000 cells) were transferred. After the antibody dilution plate was prepared, 10 μl of each dilution was transferred to the 96-well assay plate containing the labeled target cells. For the controls, 10 μl of Triton-X100 (10% stock, Fluka Analytical, Cat #93443) or 10 μl of media was added to “Max lysis” or “spontaneous release” control wells, respectively. Each antibody dilution was tested in duplicate, while 6 replicates of each control were tested.

Primary NK cells were pelleted at 1200 rpm for 5 minutes and gently resuspended to 2.5×10⁶ cells/ml in RPMI minus phenol red media, 10% FBS. To all sample wells and “no antibody” control wells (i.e., excluding “spontaneous release” and “max lysis” controls), 100 μl of NK cells (=250,000 cells) was added for an effector:target ratio of 10:1. The assay plate was incubated at 37° C. under 5% CO₂ for four hours. After the incubation, the assay plate was centrifuged at 300 rpm for 5 minutes. Thirty μl of the supernatants was added to 250 μl of Microscint 20 (Perkin Elmer, Cat #6013621) in a 96-well Picoplate (Perkin Elmer, Cat #6005185). The Cr-51 release was measured in a Packard Top Count scintillation counter.

Percent lysis was calculated as: ((ADCC experimental release−Spontaneous release)/(Max release−Spontaneous release))*100

The results of these assays are presented in FIG. 14. As shown in FIG. 14, the F243A single mutein antibody and the V264A single mutein antibody had a 5-10 fold reduction in ADCC activity when compared to the parent (wildtype) antibody; while the F243A/V264A double mutein antibody had more than 100 fold reduction in ADCC activity when compared to the parent (wildtype) antibody.

EXAMPLE 17 Statistical Analysis of OF ADCC Data of Anti-HER2 Antibody and its Fc Muteins

The objective of the study was to determine if the percentage lysis for the double mutant variant is synergistic with respect to the two single mutant variants. The determination is made by comparing the ED50 (antibody level corresponding to 50% lysis) between the double mutant variant (group 4) and the assumed additive reference curve (shown in FIG. 15 and Table 6). Since the lower limit of the ED50 for the double mutant curve is above the top antibody level assayed and is well above the upper limit of the ED50 for additive reference curve we conclude that the effect of the double mutation is much more than additive.

Statistical Methods and Results:

The objective was to determine whether the double mutation variant of the Herceptin antibody (GS6.0/F243A/V264A) demonstrates a synergistic effect compared to the two single mutation variants (GS6.0/F243A and GS6.0/V264A). There we four antibody groups: Group 1 (GS5.0), Group 2 (GS6.0/F243A), Group 3 (GS6.0/V264A) and Group 4 (GS6.0/F243A/V264A).

Data from three donors is run on separate 96-well plates. The observations from each plate are normalized by converting the values to percentage of lysis as follows:

${\% \mspace{14mu} {Lysis}} = {100 \times \left( \frac{O_{rc} - O_{N}}{O_{P} - O_{N}} \right)}$

where: O_(rc) is the observed response in the r^(th) row and c^(th) column of each plate.

O_(N) is the average response of the negative controls for each plate.

O_(p) is the average response of the positive controls for each plate.

Duplicate % lysis values for each antibody-level and group are then averaged.

The data from all four groups and all three donors are modeled jointly. We assume the ‘antibody level-response’ relationship follows a sigmoid Hill Equation (Eq. 1). We use (100% minus % lysis) as our response variable (Y) and the log antibody-levels as the explanatory variable (X). In order to make comparisons about the potency of the various mutations and fit the models, some assumptions about the model parameters for each group are made.

The form of the model used assumes:

-   -   1. The span (a) and the plateau (d), for all the 4 treatment         groups are the same.     -   2. The same slope for all the treatment groups except the GS5.0         group which is allowed to have a different slope.     -   3. The EC50 parameters (γ) are different for the different         groups.

The Hill Equation:

$\begin{matrix} {Y_{ij} = {\frac{a}{1 + \left( \frac{X_{ij}}{\gamma + \gamma_{j}} \right)^{\beta_{0} + \beta_{j}}} + d}} & \left( {{Eq}.\mspace{14mu} 1} \right) \end{matrix}$

With the constraints: γ₁=0, β₁=0 and β₂=β₃=β₄=β

Here:

Y_(ij) is the i^(th) response (100-% Lysis) for the j^(th) treatment

X_(ij) is the antibody level (on the log scale) corresponding to Y_(ij)

j=1 for GS5.0 j=2 for GS6.0/F243A

j=3 for GS6.0/V264A j=4 for GS6.0/F243A/V264A

It is further assumed that if the two single mutants (GS6.0/F243A and GS6.0/V264A) were additive than the equation for the combined effects would be:

$\begin{matrix} {Y_{i{({additive})}} = {\frac{a}{1 + \left( \frac{X_{i{({additive})}}}{\left( {\gamma + \gamma_{2} + \gamma_{3}} \right)} \right)^{\beta_{0} + \beta}} + d}} & \left( {{Eq}.\mspace{14mu} 2} \right) \end{matrix}$

with the parameters a, d, γ, γ₂, γ₃, β and β₀ being the same as in Eq. 1.

The models (Eq. 1 and Eq. 2) are fit using PROC NLIN in SAS v9.2. The observed data values and the fitted curves for the four groups, as well as the assumed additive reference curve for the two single mutation groups combined are displayed in the FIG. 15. The ED50's along with their confidence intervals (on the original scale) are given in Table 6.

TABLE 6 95% Confidence Groups ED50 Interval Group 1: GS5.0 (anti-Her 2 mAb 0.011 0.0085 0.0131 produced in GFI 5.0) Group 2: GS6.0/F243A (anti-Her 0.059 0.0457 0.0769 2 mAb F243A produced in GFI 6.0) Group 3: GS6.0/V264A (anti-Her 0.072 0.0558 0.0942 2 mAb V264A produced in GFI 6.0) Group 4: GS6.0/F243A/V264A >1 *    >1 *    >1 *    (anti-Her 2 mAb F243A/V264A doble mutein produced in GFI 6.0) Group 2&3 combined: Additive 0.407 0.3031 0.5455 Reference Curve * Estimated value is greater than the highest antibody level in the experiment.

In order to assess the effects of GS6.0/F243A/V264A compared to the two single mutations GS6.0/F243A and GS6.0/V264A; the ED50 of the group 4 is compared with the ED50 of the additive reference curve. If the confidence intervals are non-overlapping then one can conclude that the two quantities are statistically different.

The 95% confidence interval for the ED50 of the additive reference curve is (0.3031, 0.5455) while the estimate and confidence intervals for the ED50 of group 4 are all higher than 1 (the estimated values are outside the observed range of antibody-levels). The lower 95% confidence limit for the ED50 of the double mutation is >1, which is much higher than upper 95% confidence limit for the ED50 of the reference additive curve (group 2&3 combined). Hence one can conclude the two quantities are significantly different.

The above comparison of confidence intervals of ED50's is equivalent to comparing γ₄ versus the sum (γ₂+γ₃), i.e. testing the hypothesis that Ho: γ₄=(γ₂+γ₃) versus the alternative that Ha: γ₄>(γ₂+γ₃)

Let SSE_(reduced) and SSE_(full) is the residual sum of squares from the reduced model and the full model respectively. The full model is obtained by fitting Eq. 1 to the data while the reduced model is obtained by substituting γ₄ in Eq. 1 with (γ₂+γ₃).

The hypothesis:

H₀: γ₄=(γ₂+γ₃) versus H_(a): γ₄>(γ₂+γ₃)

The Test Statistic:

$F_{obs} = {\left\{ \frac{{SSE}_{reduced} - {SSE}_{full}}{{DF}_{reduced} - {DF}_{full}} \right\}/{MSE}_{full}}$

The p-value:

P(F _(obs) >F _((DF) _(reduced) _(−DF) _(full) _(),DF) _(full) )<0.0001

Since the p-value is <0.0001 we can reject H₀ and conclude that γ₄>(γ₂+γ₃).

The data and model based comparisons indicate that the double mutation GS6.0/F243A/V264A has a significantly lower % lysis, than the hypothesized combined effects of the two single mutations. The effect of the double mutation is much more than an additive effect of the single mutations.

References Relating to this Example

-   [1] SAS (r) Proprietary Software 9.2 (TS2M2), SAS Institute Inc.,     Cary, N.C., USA. -   [2] ‘Application of the Four-Parameter Logistic Model to Bioassay:     Comparison with Slope Ratio and Parallel Line Models’; Aage Vølund,     Biometrics, Vol. 34, No. 3 (September 1978), pp. 357-365

EXAMPLE 18 Construction of Anti-TNFα Fc Muteins and ADCC Evaluation

The preparation of a double Fc muteins (F243A/V264A) of an anti-TNF monoclonal antibody in Pichia pastoris was carried out using the sequences and protocols listed below. The heavy and light chain sequences of the parent (wildtype) anti-TNFα antibody are set for the in SEQ ID NOs:10 and 11. The sequence of the heavy chain of the double mutein anti-TNFα antibody is set forth in SEQ ID NO:12. The light chain sequence of the wt and double mutein anti-TNFα antibodies are identical.

The signal sequence of an alpha-mating factor predomain (SEQ ID NO:8) was fused in frame to the end of the light or heavy chain by PCR fusion. The sequence was codon optimized and synthesized by Genscript (GenScript USA Inc., 860 Centennial Ave. Piscataway, N.J. 08854, USA). Both heavy chain and light chain were cloned into antibody expression vector as similar way of constructing anti-HER2 IgG1 and its Fc muteins.

The heavy and light chains with the fused signal sequence of IgG1 and its muteins were cloned under Pichia pastoris AOX1 promoter and in front of S. cerevisiae Cyc terminator, respectively. The expression cassette of the completed heavy and light chains was put together into the final expression vector. Genomic insertion into Pichia pastoris was achieved by linearization of the vector with Spe1 and targeted integration into the Trp2 site. Plasmid pGLY6964 encodes wildtype anti-TNFα IgG1 antibody. Plasmid pGLY7715 endoes the anti-TNF alpha IgG1 F243A/V264A double mutein.

Glycoengineered Pichia GFI5.0 YGLY8316 and GFI6.0 YGLY 22834 Hosts for Producing Anti-TNFα its Fc Muteins

The genotype of the GFI5.0 strain YGLY16786 used for the expression of the anti-TNFα antibodies and its Fc muteins, is as follows: ura5Δ::ScSUC2 och1Δ::lacZ bmt1Δ::lacZ bmt2Δ::lacZbmt3Δ::lacZbmt4Δ::lacZ/KlMNN2-2 mnn4L1Δ::lacZ/MmSLC35A3 pno1Δ::lacZ ADE1::lacZ/FB8/NA10/MmSLC35A3 his1::lacZ-URA5-lacZ/XB33/SpGALE/DmUGT arg1::HIS1/KD53/TC54 PRO1::ARG1/AOX1-ScMFpreTrMNS1PRO1::ARG1/AOX1-ScMFpreTrMNS1.

The genotype of the engineered Pichia pastoris GFI 6.0 strain YGLY23423 used for the expression of the anti-TNFα Fc DM mutein is as follows: ura5Δ::ScSUC2 och1Δ::lacZ bmt2Δ::lacZ/KlMNN2-2 mnn4L1Δ::lacZ/MmSLC35A3 pno1Δ mnn4Δ::lacZ ADE1:lacZ/NA10/MmSLC35A3/FB8his1Δ::lacZ/ScGAL10/XB33/DmUGT arg1Δ::HIS1/KD53/TC54bmt4Δ::lacZ bmt1Δ::lacZ bmt3Δ::lacZ TRP2:ARG1/MmCST/HsGNE/HsCSS/HsSPS/MmST6-33ste13Δ::lacZ/TrMDS1 dap2Δ::Nat^(R) TRP5:Hyg^(R)MmCST/HsGNE/HsCSS/HsSPS/MmST6-33 Vps10-1Δ::AOX1p_LmSTT3d.

The cells were transformed, screened and purified as indicated in Examples 4-7.

Antibody Dependent Cell Cytotoxicity (ADCC) Evaluation of Anti-TNFα Fc Muteins

ADCC analysis was performed using Jurkat FlpIn target cells stably-expressing a non-cleavable variant of TNFα which has the first 12 amino acids removed—Jurkat FlpIn TNFα (Δ1-12) target cells. These cells were prepared by by transfecting Jurkat FlpIn human T-cell leukemia cells (Invitrogen) with a nonsecretable cell surface mutant of TNFα (Δ1-12 TNFα□□□□). Perez et al., Cell 63;251-258 (1990). The Δ1-12 TNFα □DNA was cloned into pcDNA5 vector (Invitrogen) to use for the transfection. □Expression of cell surface TNFα was confirmed by flow cytometry.

On the day before the assay, primary NK effector cells (Biological Specialty, Cat #215-11-10) were pelleted at 1200 rpm for 12 minutes and gently resuspended to approximately 1-1.5×10⁶ cells/ml in RPMI minus phenol red media (Invitrogen, catalog #11835-030) supplemented with 10% heat-inactivated FBS (Sigma, Cat #F4135), 10 mM Hepes (Gibco, Cat #15630), 2 mM L-glutamine (Cellgro, Cat #25-005-CI), and 1× penicillin/streptomycin (Cellgro, Cat #30-002-CI). The resuspended NK cells were incubated overnight at 37° C. under 5% CO₂.

On the day of the assay, Jurkat FlpIn TNFα (Δ1-12) target cells were centrifuged at 1200 rpm for 5 minutes, and the cell pellet was gently resuspended to a concentration of 2×10⁶ cells/ml in RPMI minus phenol red media supplemented with 5% heat-inactivated FBS. The cells were labeled with 25 μl DELFIA BATDA labeling reagent (from DELFIA EuTDA Cytotoxicity kit, Perkin Elmer, Cat #AD0116). Cells were mixed gently and incubated at 37° C. for 20 minutes with gentle mixing every 10 minutes. Cell volume was adjusted to 30 ml with DPBS containing 1.5 mM probenicid (Invitrogen, Cat #P36400) and centrifuged at 1200 rpm for 5 minutes. Cells were washed three times with 30 ml DPBS containing 1.5 mM probenicid with centrifugation at 1200 rpm for 5 minutes between each wash. After the final wash, the labeled target cells were resuspended in RPMI minus phenol red media supplemented with 5% heat-inactivated FBS and 1.5 mM probenicid to a final concentration of 2.5×10⁵ cells/ml.

Test antibodies used in the assay were: anti-TNF IgG1 wildtype antibody (designated “GFI774”) produced in GFI 5.0, non-sialylated anti-TNF IgG1 antibody (GFI774) F243A/V264A produced in GFI 5.0, and syalylated anti-TNF IgG1 antibody (GFI774) F243A/V264A produced in GFI 6.0. The non-sylalated anti-TNF IgG1 antibodies—F243A/V264A—produced in GFI 5.0 comprise the following glycoforms: 84% G2, 2% G1 and 14% hybrid N-glycans. The syalylated anti-TNF IgG1 antibodies—F243A/V264A—produced in GFI 6.0 comprise the following glycoforms: 27% A1, 50.6% A2, and 5.7% A1 hybrid (overall, more than 83% of the N-glycans are syalylated.

While the Jurkat FlpIn TNFα (Δ1-12) target cells were being labeled, 2× concentrations of antibodies were diluted using a 3-fold serial titration (starting at 40 μg/ml) in RPMI minus phenol red media supplemented with 5% heat-inactivated FBS and 1.5 mM probenicid in a 96-well polypropylene, round-bottom plate (Costar, Cat #5699; lids—Costar Cat #3931). After the dilution plate was prepared, 100 μl of each 2× dilution was transferred to a new 96-well round-bottom polypropylene plate (100 μl of media only was transferred for the “no antibody” controls). RPMI minus phenol red media supplemented with 5% heat-inactivated FBS and 1.5 mM probenicid was also transferred to the 96-well plate for the “spontaneous release” and “max lysis” controls (150 μl per well) and the “background” controls (200 μl per well). Each antibody dilution was tested in duplicate, while each control was tested in quadruplicate.

To all wells except “background” controls, 50 μl of Europium-labeled Jurkat FlpIn TNFα (Δ1-12) cells (=12,500 cells) were added and mixed gently. Primary NK cells were pelleted at 1200 rpm for 12 minutes and gently resuspended to 2.5×10⁶ cells/ml in RPMI minus phenol red media supplemented with 5% heat-inactivated FBS and 1.5 mM probenicid. To all sample wells (i.e., excluding “spontaneous release”, “max lysis”, and “background” controls), 50 μl of NK cells (=125,000 cells) was added, for an effector:target ratio of 10:1. Samples were mixed gently, and the assay plate was incubated at 37° C. for two hours. After 1 hour and 15 minutes, 10 μl of 20% Triton-X100 (Pierce Surfact-Amps X-100, Cat #28314) or 10 μl of media was added to “max lysis” or “spontaneous release” control wells, respectively. The plate was incubated at 37° C. for an additional 45 minutes (total incubation time was 2 hours). While plates were incubating, DELFIA Europium Solution (from DELFIA EuTDA Cytotoxicity kit) was equilibrated at room temperature. After the two hour incubation, the assay plate was centrifuged at 1500 rpm for 5 minutes. Twenty μl of the supernatants was transferred to a white, flat-bottom clear plate (from DELFIA EuTDA Cytotoxicity kit or Costar, Cat #3632) taking care that no bubbles were introduced. To each well, 200 μl of DELFIA Europium Solution was added, and the plate was covered with an aluminum foil seal. The assay plate was incubated at room temperature for 15 minutes with gentle shaking. Fluorescence was measured using a Perkin Elmer Envision instrument set up for reading Europium.

Percent lysis was calculated as follows:

-   1) the average of the background control was subtracted from all raw     values, -   2) the % of ADCC activity was calculated as: ((ADCC experimental     value−Spontaneous release)/(Max Lysis−Spontaneous release))*100

and

-   3) the final % lysis values were reported as % ADCC activity from     step 2 minus “No Antibody” control.

The results of these assays are presented in FIG. 16. As shown in FIG. 16, the non-sialylated and sialylated anti-TNFα IgG1—F243A/V264A double mutein had more than 1000 fold reduction in ADCC as compared to the parent (wildtype) polypeptide produced in GS5.0.

EXAMPLE 19 Complement Dependent Cytotoxicity (CDC) Evaluation of Anti-TNFα Double Fc Muteins

CDC analysis was performed using HEK293 FlpIn cells stably-expressing a non-cleavable variant of TNF α which has the first 12 amino acids removed. HEK293 FlpIn TNFα (Δ1-12) cells were grown in tissue culture flasks in Dulbecco's Minimal Essential Media (DMEM) minus phenol red (Gibco, Cat #21063) supplemented with 10% heat-inactivated FBS (Sigma, Cat #F4135), 100 ug/ml Hygromycin B (Cellgro, Cat #30-240-CR), and L-glutamine (Cellgro, Cat #25-005-CI) to 70% confluence. Cells were treated with 2 ml trypsin (Cellgro, Cat #MT25-053-CI), harvested with 8 ml DMEM minus phenol red media, 10% heat-inactivated FBS, and centrifuged at 1200 rpm for 10 minutes. The supernatant was removed and cell pellet was resuspended in DMEM minus phenol red media, heat-inactivated 10% FBS to a concentration of 4×10⁵ cells/ml. The cells were plated in 100 μl (40,000 cells) per well in a 96-well black with clear bottom plate (Costar, Cat #3603) and incubated overnight at 37° C. under 5% CO₂.

Test antibodies used in the assay were: anti-TNF IgG1 antibody (designated “GFI774”) produced in GFI 5.0, anti-TNF IgG1 antibody (GFI774) F243A/V264A produced in GFI 5.0, and anti-TNF IgG1 antibody (GFI774) F243A/V264A produced in GFI 6.0. (These antibodies are described in Example 18.) On the day of the assay, the media was aspirated with a multichannel pipettor from the wells of the 96-well plate and replaced with 50 μl of DMEM minus phenol red media, 1× penicillin/streptomycin. A 2-fold serial titration of test antibody (starting at 30 μg/ml) was prepared in DMEM minus phenol red media containing 1× penicillin/streptomycin, 10 μg/ml anti-human CD55 mouse IgG1 monoclonal antibody (IBGRL Research Products, Clone BRIC216, Cat #9404P) and 10 μg/ml anti-human CD59 mouse IgG2b monoclonal antibody (IBGRL Research Products, Clone BRIC 229, Cat #9409P). To the appropriate assay plate wells, 50 μl of the diluted antibody was added. Assay negative controls were assay media alone and human IgG (Jackson ImmunoResearch, Cat #009-000-003) diluted in the assay DMEM minus phenol red media (containing CD55 and CD59 antibodies). The assay lysis control was 0.25% Triton X100 (10% stock, Fluka, Cat #93443) diluted in the assay DMEM minus phenol red media (containing CD55 and CD59 antibodies). Each test antibody concentration was tested in duplicate while the assay controls were tested in triplicate. The assay plate containing test samples was mixed by tapping lightly, and the plate was incubated for approximately 10 minutes at 37° C. while the human complement sera was being prepared. Three ml of human complement (QUIDEL, Cat #A113) was diluted 1:2 with 3 ml of DMEM minus phenol red media containing 1× penicillin/streptomycin, and 50 μl of the diluted complement was added to the assay plate wells. The assay plate was mixed by tapping lightly, and the plate was incubated for 4 hours at 37° C. under 5% CO₂. A solution of 40% alamar blue (Biosource, Cat #DAL1100) was prepared by diluting 100% stock with DMEM minus phenol red media containing 1× penicillin/streptomycin, and 50 μl of the diluted alamar blue solution was added to the assay plate wells (=10% final). The assay plate was mixed by tapping lightly, and the plate was incubated overnight (15-20 h) at 37° C. under 5% CO₂. The next day, the assay plate was incubated for 10 minutes on a shaker at room temperature and fluorescence was read at excitation 544 nm, emission 590 nm. Percent CDC was calculated as: (1−(Sample raw fluorescence unit (RFU)−Triton RFU)/(Media RFU−Triton RFU))*100

The results of these assays are presented in FIG. 17. As shown in FIG. 17, the non-sialylated and sialylated anti-TNFα IgG1—F243A/V264A double mutein had about a 10 fold reduction in CDC activity as compared to the parent (wildtype) antibody.

EXAMPLE 20 Effect of the Anti-TNFα Antibody and its Fc Muteins in a Collagen-Antibody Induced Arthritis (AIA) Model

MODEL INDUCTION: AIA (Antibody induced arthritis) is induced with a commercial Arthrogen-CIA® arthritogenic monoclonal antibody (purchased from Chondrex) consisting of a cocktail of 5 monoclonal antibodies, clone A2-10 (IgG2a), F10-21 (IgG2a), D8-6 (IgG2a), D1-2G(IgG2b), and D2-112 (IgG2b), that recognize the conserved epitopes on various species of type II collagen.

ANIMALS: 10 week old B10.RIII male mice which are susceptible to arthritis induction without additional of co-stimulatory factors were used. These animals were purchased from Jackson Laboratory.

CLINICAL SCORING: Paw swelling was measured daily post-induction of arthritis. The severity of the disease was graded on a 0-3 scale per paw as follows: 0, normal; 1, swelling of one digit; 2, swelling of two or more digits; 3, swelling of the entire paw. The maximal clinical score per mouse is 12.

STUDY DESIGN: Arthritis was induced by passive transfer of 3 mg of anti-CII mAb pathogen cocktail IV on day 0.

Groups of Mice were treated subcutaneously with following reagents:

Group/Reagent Lot Dose A. Naïve *** *** B. Isotype IgG1 78ABY 33mpk C. Asialyated Anti-TNF 36ADV 33mpk D. α2,6 Sialyated Anti-TNF 37ADV 33mpk E. mTNFR-Ig 82ABW 33mpk F. GAMMAGARD 84ADU 33mpk G. GAMMAGARD 84ADU 1000mpk H. HUMIRA 85ADU 33mpk

Group n=5 for all groups except Group A and H which have n=3.

An isotype IgG1 antibody was used as a control. The antibody bound to mouse anti-hexon and had the designation “27F11”.

The sample identified as “Asialyated Anti-TNF” corresponds to the anti-TNF antibody as described in Example 18 produced in GFI 5.0 comprising the F243A/V264A mutations. The sample identified as “α2,6 Sialyated Anti-TNF” corresponds to the anti-TNF antibody described in Example 18 produced in GFI 6.0 comprising the F243A/V264A mutations. The non-sylalated anti-TNF IgG1 antibodies—F243A/V264A—produced in GFI 5.0 comprise the following glycoforms: 84% G2, 2% G1 and 14% hybrid N-glycans. The syalylated anti-TNF IgG1 antibodies—F243A/V264A—produced in GFI 6.0 comprise the following glycoforms: 27% A1, 50.6% A2, and 5.7% A1 hybrid (overall, more than 83% of the N-glycans are syalylated).

mTNFR-Ig is an immunoadhesin (anti-TNF receptor Ig-fusion protein) comprising the extracellular domain of mTNFR2 connected to mIgG1 Fc starting at the hinge and spanning the CH2 and the CH3 regions, and comprising the amino acid sequence of SEQ ID NO:16 produced in CHO cells.

GAMMAGARD liquid was purchased from Baxter Corp.

HUMIRA was purchased from Abbott Labs. HUMIRA comprise asyalylated N-glycans with very little terminal galactose.

All groups of mice were dosed on day minus 1 and day 7 with the exception of mTNFR-Ig, which received a total of three doses at days minus 1, +3, and +7. The Clinical Score was monitored for 14 days.

The results of these experiments are shown in FIGS. 18A and 18B. In this study, GAMMAGARD did not demonstrate clinical efficacy. Mu-TNF-Ig showed good protection from disease in 4 out of 5 mice. HUMIRA had very similar disease kinetics as the control IgG1. Asialyated Anti-TNF showed some dampening of disease. The α2,6 sialyated Anti-TNF showed good disease protection in 5 out of 5 mice, and scores were comparable to anti-TNF therapy.

GENE EXPRESSION ANALYSIS: Expression of inflammatory and bone remodeling genes were determined by RT/PCR analysis of hind paws from isotype, a2,6 sialylated mAb or mTNFR-Ig treated mice (n=4 per group). To perform the quantitative PCR, total RNA was isolated from hind paws using RNA STAT-60 (Tel-Test, Friendswood, Tex., USA). Total RNA (5 μg) was subjected to treatment with DNase (Roche). DNase-treated total RNA was reverse-transcribed using Superscript II (Gibco/BRL). Primers were designed using Primer Express (PE Biosystems), or obtained commercially from Applied Biosystems.

Real-time quantitative PCR on 10 ng of cDNA from each sample was performed using one of two methods. In the first method, two gene-specific unlabelled primers were utilized at 400 nM in a Perkin Elmer SYBR green real-time quantitative PCR assay utilizing an ABI 5700 Instrument. In the second method, two unlabelled primers at 900 nM each were used with 250 nM of FAM-labelled probe (Applied Biosystems) in a TAQMAN™ real-time quantitative PCR reaction on an ABI 7700 sequence detection system. The absence of genomic DNA contamination was confirmed using primers that recognize genomic regions of the CD4 promoter—samples with detectable DNA contamination by real-time PCR were excluded from the study. Ubiquitin levels were measured in a separate reaction and used to normalize the data by the Δ−Δ Ct method, using the mean cycle threshold (Ct) value for ubiquitin and the genes of interest for each sample; the equation 1.8 e (Ct ubiquitin−Ct gene of interest)×104 was used to obtain the normalized values. The results are shown in Table 7. Data shown is fold-increase of inflammatory/bone remodeling gene expression over that of gene expression in hind paws of naïve control mice.

TABLE 7 Fold induction over naïve mice Isotype α2,6 SA mTNFR-Ig Gene 33mpk Humira 33mpk 33mpk IL-1b 14.43 0.90 0.43 IL-6 18.45 0.75 0.77 Tnfsf2 - Tnfa 2.63 0.98 0.70 Tnfsf11 - RankI 10.94 1.27 0.67 Tnfrsf11a - Rank 2.21 0.86 0.74 MDL-1 long 5.25 1.82 0.88 F4/80 3.20 1.75 0.56 Cd11b 3.57 1.35 1.07 Cd14 2.48 1.53 0.52 Dap12 4.36 1.33 0.90 TIMP-1 15.85 1.44 1.38 PU.1 - Sfpi1 3.88 1.09 0.79 Trap - Acp5 10.19 1.85 1.17 Ccl2 - Mcp1 8.01 1.24 0.87 Ccl3 - Mip1a 4.06 1.09 0.58 Cxcl1 - Groa 16.39 1.65 0.69 Cxcl2 - Grob 5.33 0.50 0.32 Atp6v0d2 17.45 2.05 1.74 Mmp9 13.53 1.88 1.32 Fcgr1 - Cd64 4.51 1.04 0.68 Fcgr2b - Cd32a 2.75 1.11 0.71 Fcgr3 0.57 0.74 0.66 Fcgr4 6.54 1.38 1.04 Ctsk 6.85 1.65 0.91 Calcr 1.80 0.49 0.94 Cd68 - Scard1 3.19 1.29 0.94 Itgb2 - Cd18 3.90 1.33 0.88

EXAMPLE 21 Effect of the Anti-TNFα Antibody or its Fc Muteins in a Collagen-Antibody Induced Arthritis (AIA) Model

The experiment described in Example 20 was repeated as described therein, with the exception that GAMMAGARD was administered intravenously (while all other reagents were administered subcutaneously).

STUDY DESIGN: Arthritis was induced as described in Example 20.

All groups of mice were dosed on day minus 1 with the exception of mTNFR-Ig, which received a total of two doses at days minus 1 and +3. The Clinical Score was monitored for 7 days.

Groups of Mice were treated with following reagents:

Group/Reagent Lot Dose Naïve *** *** Isotype IgG1 78ABY 33mpk Asialyated Anti-TNF 36ADV 33mpk α2,6 Sialyated Anti-TNF 37ADV 33mpk or 6.6 mpk α2,3 Sialyated Anti-TNF 19ADX 33mpk mTNFR-Ig 82ABW 33mpk GAMMAGARD 84ADU 1000mpk HUMIRA 85ADU 33mpk 18 ADX PNG Humira 18ADX 33mpk 20 ADX No Glyco 20ADX 33mpk Group n=5 for all groups

The reagents: “Isotype IgG1”, “Asialyated Anti-TNF”, “α2,6 Sialyated Anti-TNF, mTNFR-Ig , GAMMAGARD and HUMIRA were described in Example 20.

The reagent identified as “α2,3 Sialyated Anti-TNF” corresponds to the anti-TNF antibody described in Example 18 produced in GFI 6.0 comprising the F243A/V264A, which was in vitro treated with neuraminidase to eliminate the α2,6 linked sialic acid, and further in vitro treated with α2,3 sialyltransferase. Briefly, the purified antibody (4-5 mg/ml) was in the formulation buffer comprising 6.16 mg sodium chloride, 0.96 mg monobasic sodium phosphate dehydrate, 1.53 mg dibasic sodium phosphate dihydrate, 0.30 mg sodium citrate, 1.30 mg citric acid monohydrate, 12 mg mannitol, 1.0 mg polysorbate 80 per 1 ml adjusted to pH to 5.2. Neuraminidase (10 mU/ml) was added to antibody mixture and incubated at 37 C for at least 5 hrs or until desialylation reached completion. The desialylated material was applied onto CaptoMMC (GE Healthcare) column purification to remove neuraminidase and reformulated in Sialyltransferase buffer (50 mM Hepes pH 7.2 150 mM NaCl, 2.5 mM CaCl2, 2.5 mM MgCl2, 2.5 mM MnCl2) at 4 mg/ml. Mouse α2,3 sialyltransferase recombinant enzyme expressed in Pichia and purified via his-tag was used for α2,3 sialylic acid extension. The enzyme mixture was formulated in PBS in the presence of Protease Inhibitor Cocktail (Roche™, cat #11873580001) at 1.2 mg/ml. Prior to the sialylation reaction, pepstatin (50 ug/ml), chymostatin (2 mg/ml) and 10 mM CMP-Sialic acid were added to the enzyme mixture followed by sterilization through 0.2 μm filter. One ml of enzyme mixture was added to 10 ml desialylated material. The reaction was carried out at 37 C for 8 hrs. The sialylation yield was confirmed by mass determination by ESI-Q-TOF. The final material was purified using MabSelect (GE Healthcare) and formulated in the buffer described above and sterile-filtered (0.2 μm membrane).

The reagent identified as “18 ADX PNG Humira” corresponds to the anti-TNF antibody described in Example 18 produced in GFI 6.0 comprising the F243A/V264A which was in vitro treated with PNG'ase F to remove all N-glycans. The PNGase F enzyme was obtained Prozyme, Inc., and used with a stoichiometry of 2 μl of commercial enzyme to 4 mg of IgG1 at pH 7.4. The digested material was purified using Mabselect (GE Healthcare). The final material was formulated and sterile-filtered (0.2 μm membrane).

The reagent identified as “20 ADX No Glyco” corresponds to the wildtype anti-TNF antibody described in Example 18, comprising a single mutation at position 297 which results in no glycosylation, produced in a GFI5.0 YGLY8316. The strain producing this antibody was clarified by centrifugation for 15 min at 13,000 g in a Sorvall Evolution RC (kendo, Asheville, N.C.). The capture step was performed using MabSelect (GE Healthcare) followed by a polishing step using Capto MMC (GE Healthcare). The final material was formulated and sterile-filtered (0.2 μm membrane).

The results of these experiments are shown in FIGS. 19A and 19B.

GENE EXPRESSION ANALYSIS: Expression of inflammatory and bone remodeling genes were determined by RT/PCR analysis. To perform the quantitative PCR, total RNA was isolated from hind paws using RNA STAT-60 (Tel-Test, Friendswood, Tex., USA). Total RNA (5 μg) was subjected to treatment with DNase (Roche). DNase-treated total RNA was reverse-transcribed using Superscript II (Gibco/BRL). Primers were designed using Primer Express (PE Biosystems), or obtained commercially from Applied Biosystems.

Real-time quantitative PCR on 10 ng of cDNA from each sample was performed using one of two methods. In the first method, two gene-specific unlabelled primers were utilized at 400 nM in a Perkin Elmer SYBR green real-time quantitative PCR assay utilizing an ABI 5700 Instrument. In the second method, two unlabelled primers at 900 nM each were used with 250 nM of FAM-labelled probe (Applied Biosystems) in a TAQMAN™ real-time quantitative PCR reaction on an ABI 7700 sequence detection system. The absence of genomic DNA contamination was confirmed using primers that recognize genomic regions of the CD4 promoter—samples with detectable DNA contamination by real-time PCR were excluded from the study. Ubiquitin levels were measured in a separate reaction and used to normalize the data by the Δ−Δ Ct method, using the mean cycle threshold (Ct) value for ubiquitin and the genes of interest for each sample; the equation 1.8 e (Ct ubiquitin−Ct gene of interest)×104 was used to obtain the normalized values. The results are shown in Table 8. Data shown is fold-increase of inflammatory/bone remodeling gene expression over that of gene expression in hind paws of naïve control mice.

TABLE 8 Fold induction over naïve mice Iso- α type Asialyated α 2,3 Gamma 2,6-high Control Humira Humira Guard TNFR-Ig Humira Gene 78ABY 36ADV 19ADX 84ADU 82ABW 37ADV IL-1b 47.09 25.75 58.94 1.58 1.76 4.55 IL-6 26.18 3.64 10.71 0.37 0.80 0.59 RankL 186.32 138.96 347.65 6.25 20.36 21.26 MDL-1 4.65 3.79 5.71 1.23 0.97 1.93 Cd11b 9.43 13.20 23.11 1.77 3.17 5.25 Dap12 4.45 3.54 6.01 1.81 1.59 2.26 TIMP-1 15.98 6.80 18.43 1.40 1.21 1.38 PU.1 6.91 9.18 15.50 1.00 1.48 3.17 Trap - 13.88 15.44 35.34 1.19 2.14 5.72 Acp5 MCP1 14.96 5.66 11.62 1.46 1.44 1.59 Cxcl1 - 23.04 4.92 18.10 0.39 1.34 1.41 Groa Cxcl2 - 30.83 6.30 16.06 2.93 1.15 0.99 Grob Atp6v0d2 16.62 9.81 21.87 1.60 1.81 2.68 Mmp9 15.00 12.33 26.43 1.69 2.26 3.24 Fcgr1 - 5.84 4.48 8.68 1.87 1.59 2.36 Cd64 Fcgr2b - 3.63 2.81 4.34 1.48 1.59 1.60 Cd32a Fcgr3 4.07 6.64 7.73 1.33 1.81 4.86 Fcgr4 8.91 7.79 14.10 2.93 2.12 4.15 Ctsk 13.13 15.04 30.55 1.25 2.20 4.17 Itgb2 6.46 7.66 17.07 1.16 1.68 3.24 MIP1a 5.12 3.15 5.19 1.39 1.08 1.47

EXAMPLE 22 FcγR Binding Assays of Anti-TNF Antibodies and Muteins

Fcγ receptor binding assays were carried out at as described in Example 1, using the anti-TNF antibodies described in Example 18. The results are shown in FIG. 20 and Tables 9-10.

TABLE 9 Reduction in Binding to Fcγ receptor compared to wildtype (parent) antibody produced in GS 5.0 FcγIIIa FcγIIIa Sample FcγRI FcγRIIa FcγRIIb/c LF LV Anti-TNF DM ↓ 4-10 ↓ 60-100 non- ↓ 11-12 ↓ 1.5-1.7 (produced in binding GS5.0) Anti-TNF DM ↓ 2-3  ↓ 100 non- ↓ 10-12 ↓ 1.5-2.0 (produced in binding GS6.0) ↓ indicates decreased affinity fold ↑ indicates increased affinity fold

TABLE 10 Reduction in Binding to Fcγ receptor compared to commercial HUMIRA FcγIIIa FcγIIIa Sample FcγRI FcγRIIa FcγRIIb/c LF LV Anti-TNF DM ↓ 4-11 non- ↓ 20 no no (produced in binding differ- differ- GS5.0) ence ence Anti-TNF DM ↓ 2-4  non- ↓ 20 no no (produced in binding differ- differ- GS6.0) ence ence Anti-TNF wildtype no ↑ 30  ↑ 2 ↑ 13-15 ↑ 1.8-2.0 (produced in difference GS5.0) ↓ indicates decreased affinity fold ↑ indicates increased affinity fold

EXAMPLE 23

Construction of Additional Anti-Her2 Fc Double Muteins (at positions 243/264) and their N-Glycan Composition

Additional Fc double muteins of the Her2 IgG1 antibody described in Example 2 were constructed using a Stratagene QuikChange® Site-Directed Mutagenesis Kit Catalog #200518 (30 reactions) following the protocol they provided to process saturation mutagenesis with degenerate primers. The signal sequence of an alpha-mating factor predomain was fused in frame to the 5′ end of the light chain and heavy chain. The resulting heavy and light chains with the fused signal sequence of IgG1 and its muteins were cloned under Pichia pastoris AOX1 promoter and in front of S. cerevisiae Cyc terminator, respectively. The expression cassette of the completed heavy and light chains was put together into the final expression vector.

The vectors were expressed in glycoengineered Pichia GFI6.0 hosts cells YGLY3582 and YGLY22812.

TABLE 11 Strain Description YGLY4563 GFI6.0 host YGLY3582 strain making anti-Her2 F243A/V264A double mutein YGLY23294 GFI6.0 host YGLY22812 strain making anti-Her2 F243Y/V264G double mutein YGLY23280 GFI6.0 host YGLY22812 strain making anti-Her2 F243T/V264G double mutein YGLY23301 GFI6.0 host YGLY22812 strain making anti-Her2 F243L/V264A double mutein YGLY25259 GFI6.0 host YGLY22812 strain making anti-Her2 F243L/V264N double mutein YGLY23305 GFI6.0 host YGLY22812 strain making anti-Her2 F243V/V264G double mutein

The genotype of the GFI6.0 YGLY3582 strain is described at Example 4 (same as YGLY4563).

The genotype of the engineered Pichia pastoris GFI 6.0 YGLY22812 strain used for the expression of the anti-TNFα Fc DM mutein, is as follows: ura5Δ::ScSUC2 och1Δ::lacZ bmt2Δ::lacZ/KlMNN2-2 mnn4L1Δ::lacZ/MmSLC35A3 pno1Δ mnn4Δ::lacZ ADE1:lacZ/NA10/MmSLC35A3/FB8his1Δ::lacZ/ScGAL10/XB33/DmUGT arg1Δ::HIS1/KD53/TC54bmt4Δ::lacZ bmt1Δ::lacZ bmt3Δ::lacZ TRP2:ARG1/MmCST/HsGNE/HsCSS/HsSPS/MmST6-33ste13Δ::lacZ/TrMDS1 dap2Δ::NatR TRP5:HygRMmCST/HsGNE/HsCSS/HsSPS/MmST6-33 Vps10-1Δ::AOX1p_LmSTT3d. YGLY23294, YGLY23280, YGLY23301, YGLY25259 and YGLY23305 have the same genotype except they express different mutein listed in Table 11.

The strains were cultivated in 500 ml shake flasks with 300 ml of 2% BMGY media and shaked at 24° C. for 3 days.

Protocol for induction of shake flasks: Collect the total volume of each culture (300 ml) into falcon tubes and spin at 2500 rpm for 5 minutes. Pour away supernatant and resuspend cell pellets in a final volume of 150 ml 2% BMMY and 360 ul PMTi4 (stock concentration 0.65 mg/ml). Transfer to a fresh 500 ml shake flask and shake at 24° C. for 2 days. Spin down the induced cultures and collect the supernatant into fresh falcon tubes.

The secreted antibodies were purified by protein A column using GE Healthcare, STREAMLINE rProtein A (catalog no. 17-1281-01) and BioRad poly-prep chromatography columns (10 ml) (catalog no. 731-1550). The following buffers were used:

-   -   Wash buffer #1: 20 mM Tris pH 7.0, 1M NaCl     -   Wash buffer #2: 20 mM Tris pH 7.0     -   Neutralization buffer: 1M Tris pH 8.0-pH 9.0     -   Elution buffer: 100 mM or 50 mM Sodium Citrate pH 3.0     -   Cleaning solution: 6M Urea in water.

The purification protocol is as follows:

-   -   Add 500 ul of STREAMLINE rProtein A beads to each BioRad column.         The beads should be in 20% ethanol. The composition of the bead         slurry should be 50% beads, 50% liquid.     -   Once the protein A beads are in the column they should be washed         with 5 mls of Wash buffer #2 (discard the flow through)     -   Add 10 mls of supernatant to the BioRad column. During this step         the antibodies will bind to the protein A beads. (discard the         flow through)     -   Wash away undesired excess proteins by adding 5 mls of Wash         buffer #1 to the column. (discard the flow through)     -   Wash the column again by adding 5 mls of Wash buffer #2 (discard         the flow through)     -   Add 1 ml of Neutralization buffer to the 15 ml protein         collection tube.     -   Place the BioRad column into the 15 ml collection tube.     -   Add 3 mls of Elution buffer to the BioRad column. This will         remove the desired antibodies from the protein A beads.     -   Collect the eluted protein in the 15 ml protein collection tube.     -   Determine the concentration of the eluted protein by Bradford         assay (use 10 ul of protein for Bradford assay).

To quantify the relative amount of each glycoform, the N-glycosidase F released glycans were labeled with 2-aminobenzidine (2-AB) and analyzed by HPLC as described in Choi et al., Proc. Natl. Acad. Sci. USA 100: 5022-5027 (2003) and Hamilton et al., Science 313: 1441-1443 (2006). Table 12 shows glycan profile of the produced antibodies (NQP=no quantification possible).

TABLE 12 M5 G2 M7 M8 A1 A1H A2 HM YGLY4563 2.4 3.2 2.8 2.5 7.9 9.6 67.3 4.3 YGLY23294 16.9 NQP — — 23.4 — 59.7 — YGLY23280 20.6 NQP — — 16.3 — 63.1 — YGLY23301 15.5 — — — 21.9 — 59.4 — YGLY25259 27.7 NQP — — 23.9 — 48.3 — YGLY23305 29.6 NQP — — 18.1 — 52.4 —

The binding of the above mutants to various Fcγ receptors was determined using the method described in Example 11. The results are shown in FIG. 21 and Tables 13 and 14.

TABLE 13 Binding Affinity as compared to the F243A/V264A double mutein Sample FcγRIIb/c FcγIIIa LF FcγIIIa LV YGLY23301  ↑ 2 ↑ 20   ↑ 2.2 YGLY23305 ↑ 12 ↑ 15 ↑ 3 YGLY23280 no change  ↓ 4 ↑ 3 YGLY23294 ↑ 50 ↑ >100  ↑ 9 YGLY25259 no change ↑ >30  ↑ 4

TABLE 14 Binding Affinity as compared to commercially available Herceptin Sample FcγRIIb/c FcγIIIa LF FcγIIIa LV YGLY4563 Non-binding ↓ 8.4 no change YGLY23301 ↓ 3 ↑ 2.4 ↑ 2.2 YGLY23305 ↑ 2 no change no change YGLY23280 ↓ 3 ↓ 25   ↓ 6   YGLY23294 ↑ >15  ↑ 10   ↑3.5 YGLY25259   ↓ 2.5 ↑ 2.5 no change

EXAMPLE 23 Anti-PCKS9 Parent Antibody and Fc Muteins

An anti-PCSK9 antibody having the heavy chain amino acid sequence of SEQ ID NO:13 and the light chain amino acid sequence of SEQ ID NO:14 was also constructed, and mutations F243A and V264A of the heavy chain were introduced as described in Example 2. The heavy chain amino acid sequence of the anti-PCSK9 double mutein is shown in SEQ ID NO:15. The wild-type and double mutein forms of the antibody were expressed in Glycoengineered Pichia GFI5.0 and GFI6.0, and purified according to the procedures described in Examples 3-7, and their ability to bind the various Fcγ receptors was determined using the procedures described in Example 11. The anti-PCSK9 double mutein antibody (produced in GFI6.0, comprising the heavy chain amino acid sequence of SEQ ID NO:15 and the light chain amino acid sequence of SEQ ID NO:14), when compared to the parent antibody (produced in GFI5.0) had approximately a 4 fold fold reduction in binding to FcγRI, a 8-60 fold reduction in binding to FcγRIIIa LF, a 2-6 fold reduction in binding to FcγRIIIa LV, and no detectable binding to FcγRIIa or FcγRIIb/c.

EXAMPLE 24 Effect of the Anti-Her2 Antibody and its Fc Muteins in a Collagen-Antibody Induced Arthritis (AIA) Model

MODEL INDUCTION: AIA (Antibody induced arthritis) is induced with a commercial Arthrogen-CIA® arthritogenic monoclonal antibody (purchased from Chondrex) consisting of a cocktail of 5 monoclonal antibodies, clone A2-10 (IgG2a), F10-21 (IgG2a), D8-6 (IgG2a), D1-2G(IgG2b), and D2-112 (IgG2b), that recognize the conserved epitopes on various species of type II collagen.

ANIMALS: 10 week old B10.RIII male mice which are susceptible to arthritis induction without additional of co-stimulatory factors were used. These animals were purchased from Jackson Laboratory.

CLINICAL SCORING: Paw swelling was measured daily post-induction of arthritis. The severity of the disease was graded on a 0-3 scale per paw as follows: 0, normal; 1, swelling of one digit; 2, swelling of two or more digits; 3, swelling of the entire paw. The maximal clinical score per mouse is 12.

STUDY DESIGN: Arthritis was induced by passive transfer of 3 mg of anti-CII mAb pathogen cocktail IV on day 0.

All groups of mice were dosed on day minus 1. The Clinical Score was monitored for 7 days.

Groups of Mice were treated subcutaneously with following reagents:

Group/Reagent Lot Dose A. Naïve *** *** B. Isotype IgG1 78ABY 33mpk C. Asialyated Anti-Her2 38ADV 33mpk D. α2,6 Sialyated Anti- Her2 37ADV 33mpk E. muTNFR-Ig 82ABW 33mpk All Groups n=5 except group E which has an n=4

An isotype IgG1 antibody was used as a control. The antibody bound to mouse anti-hexon and had the designation “27F11”.

The sample identified as “Asialyated Anti-Her2” corresponds to the anti-Her2 antibody comprising the F243A/V264A mutations produced in GFI 5.0 strain YGLY19709. The YGLY19709 strain was derived from the anti-Her2 antibody producing strain YGLY13979, which was transformed with plasmid pGLY6301 for expressing LsSTT3d. Strain YGLY13979 and plasmid pGLY6301 are described in patent application: WO 2010/099186.

The sample identified as “α2,6 Sialyated Anti-Her2” corresponds to the anti-Her2 antibody comprising the F243A/V264A mutations produced in GFI 6.0 strain YGLY4563 (see Example 4).

mTNFR-Ig is an immunoadhesin (anti-TNF receptor Ig-fusion protein) comprising the extracellular domain of mTNFR2 connected to mIgG1 Fc starting at the hinge and spanning the CH2 and the CH3 regions, and comprising the amino acid sequence of SEQ ID NO:16 produced in CHO cells.

The results of these experiments are shown in FIG. 22.

SEQUENCE LISTING SEQ ID NO: Description Sequence 1 Heavy chain EVQLVESGGGLVQPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWVARIYPTNGYTRYADSVK amino acid GRFTISADTSKNTAYLQMNSLRAEDTAVYYCSRWGGDGFYAMDYWGQGTLVTVSSASTKGPSVFP sequence of LAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSS wt anti-HER LGTQTYICNVNHKPSNTKVDKKVEPKSCDKTHTCPPCPAPELLGGPSVFLFPPKPKDTLMISRTP antibody EVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCK VSNKALPAPIEKTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKGFYPSDIAVEWESNGQP ENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 2 Light chain DIQMTQSPSSLSASVGDRVTITCRASQDVNTAVAWYQQKPGKAPKLLIYSASFLYSGVPSRFSGS amino acid RSGTDFTLTISSLQPEDFATYYCQQHYTTPPTFGQGTKVEIKRTVAAPSVFIFPPSDEQLKSGTA sequence of SVVCLLNNFYPREAKVQWKVDNALQSGNSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYACE anti-HER VTHQGLSSPVTKSFNRGEC antibody 3 Primer GGTCCTTCCGTTTTTTTGGCCCCACCAAAGCCAAAGGACACTTTG 4 Primer GTGTCCTTTGGCTTTGGTGGGGCCAAAAAAACGGAAGGACCACC 5 Primer gttacatgtgttgttgctgacgtttctcacgag 6 Primer GGTCCTCGTGAGAAACGTCAGCAACAACACATG 7 Alpha-mating GAATTCGAAACGATGAGATTTCCTTCAATTTTTACTGCTGTTTTATTCGCAGCATCCTCCGCATT factor DNA AGCT sequence 8 Alpha-mating MRFPSIFTAVLFAASSALA factor amino acid sequence 9 Heavy chain EVQLVESGGGLVQPGGSLRLSCAASGFNIKDTYIHWVRQAPGKGLEWVARIYPTNGYTRYADSVK amino acid GRFTISADTSKNTAYLQMNSLRAEDTAVYYCSRWGGDGFYAMDYWGQGTLVTVSSASTKGPSVFP sequence of LAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSS double mutein LGTQTYICNVNHKPSNTKVDKKVEPKSCDKTHTCPPCPAPELLGGPSVFLAPPKPKDTLMISRTP anti-HER EVTCVVADVSHEDPEVKFNWYVDGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLN antibody GKEYKCKVSNKALPAPIEKTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKGFYPSDIAVE WESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSP GK 10 heavy chain E V Q L V E S G G G L V Q P G R S L R L S C amino acid A A S G F T F D D Y A M H W V R Q A P G K G sequence of L E W V S A I T W N S G H I D Y A D S V E G wildtype R F T I S R D N A K N S L Y L Q M N S L R A anti-TNF E D T A V Y Y C A K V S Y L S T A S S L D Y alpha W G Q G T L V T V S S A S T K G P S V F P L antibody A P S S K S T S G G T A A L G C L V K D Y F P E P V T V S W N S G A L T S G V H T F P A V L Q S S G L Y S L S S V V T V P S S S L G T Q T Y I C N V N H K P S N T K V D K K V E P K S C D K T H T C P P C P A P E L L G G P S V F L F P P K P K D T L M I S R T P E V T C V V V D V S H E D P E V K F N W Y V D G V E V H N A K T K P R E E Q Y N S T Y R V V S V L T V L H Q D W L N G K E Y K C K V S N K A L P A P I E K T I S K A K G Q P R E P Q V Y T L P P S R D E L T K N Q V S L T C L V K G F Y P S D I A V E W E S N G Q P E N N Y K T T P P V L D S D G S F F L Y S K L T V D K S R W Q Q G N V F S C S V M H E A L H N H Y T Q K S L S L S P G 11 Light chain D I Q M T Q S P S S L S A S V G D R V T I T amino acid C R A S Q G I R N Y L A W Y Q Q K P G K A P sequence of K L L I Y A A S T L Q S G V P S R F S G S G anti-TNF S G T D F T L T I S S L Q P E D V A T Y Y C alpha Q R Y N R A P Y T F G Q G T K V E I K R T V antibody A A P S V F I F P P S D E Q L K S G T A S V V C L L N N F Y P R E A K V Q W K V D N A L Q S G N S Q E S V T E Q D S K D S T Y S L S S T L T L S K A D Y E K H K V Y A C E V T H Q G L S S P V T K S F N R G E C 12 Heavy chain E V Q L V E S G G G L V Q P G R S L R L S C amino acid A A S G F T F D D Y A M H W V R Q A P G K G sequence of L E W V S A I T W N S G H I D Y A D S V E G double mutein R F T I S R D N A K N S L Y L Q M N S L R A anti-TNF E D T A V Y Y C A K V S Y L S T A S S L D Y alpha W G Q G T L V T V S S A S T K G P S V F P L antibody A P S S K S T S G G T A A L G C L V K D Y F P E P V T V S W N S G A L T S G V H T F P A V L Q S S G L Y S L S S V V T V P S S S L G T Q T Y I C N V N H K P S N T K V D K K V E P K S C D K T H T C P P C P A P E L L G G P S V F L A P P K P K D T L M I S R T P E V T C V V A D V S H E D P E V K F N W Y V D G V E V H N A K T K P R E E Q Y N S T Y R V V S V L T V L H Q D W L N G K E Y K C K V S N K A L P A P I E K T I S K A K G Q P R E P Q V Y T L P P S R D E L T K N Q V S L T C L V K G F Y P S D I A V E W E S N G Q P E N N Y K T T P P V L D S D G S F F L Y S K L T V D K S R W Q Q G N V F S C S V M H E A L H N H Y T Q K S L S L S P G 13 Heavy chain QVQLVQSGAEVKKPGASVKVSCKVSGYTFTDYYMNWVRQAPGQGLEWIGDINPNNGGAIYNQKFK amino acid GRATLTVDKSTSTAYMELRSLRSDDTAVYYCTSGIITEIAEDFWGQGTLVTV S S A S sequence of T K G P S V F P L A P S S K S T S G G T A A wt anti-PCSK9 L G C L V K D Y F P E P V T V S W N S G A L antibody T S G V H T F P A V L Q S S G L Y S L S S V V T V P S S S L G T Q T Y I C N V N H K P S N T K V D K K V E P K S C D K T H T C P P C P A P E L L G G P S V F L F P P K P K D T L M I S R T P E V T C V V V D V S H E D P E V K F N W Y V D G V E V H N A K T K P R E E Q Y N S T Y R V V S V L T V L H Q D W L N G K E Y K C K V S N K A L P A P I E K T I S K A K G Q P R E P Q V Y T L P P S R D E L T K N Q V S L T C L V K G F Y P S D I A V E W E S N G Q P E N N Y K T T P P V L D S D G S F F L Y S K L T V D K S R W Q Q G N V F S C S V M H E A L H N H Y T Q K S L S L S P G 14 Light chain DIQMTQSPSSLSASVGDRVTITCKASQNVGTNVVWYQQKPGKAPKALIHSASYRYSGVPSRFSGS amino acid GSGTDFTLTISSLQPEDFATYYCQQYKTYPYTFGQGTKVEIKRTVAAPSVFIFPPSDEQLKSGTA sequence of SVVCLLNNFYPREAKVQWKVDNALQSGNSQESVTEQDSKDSTYSLSSTLTLSKADYEKHKVYACE wt anti-PCSK9 VTHQGLSSPVTKSFNRGEC antibody 15 Heavy chain QVQLVQSGAEVKKPGASVKVSCKVSGYTFTDYYMNWVRQAPGQGLEWIGDINPNNGGAIYNQKFK amino acid GRATLTVDKSTSTAYMELRSLRSDDTAVYYCTSGIITEIAEDFWGQGTLVTV S S A S sequence of T K G P S V F P L A P S S K S T S G G T A A double mutein L G C L V K D Y F P E P V T V S W N S G A L anti-PCSK9 T S G V H T F P A V L Q S S G L Y S L S S V antibody V T V P S S S L G T Q T Y I C N V N H K P S N T K V D K K V E P K S C D K T H T C P P C P A P E L L G G P S V F L A P P K P K D T L M I S R T P E V T C V V A D V S H E D P E V K F N W Y V D G V E V H N A K T K P R E E Q Y N S T Y R V V S V L T V L H Q D W L N G K E Y K C K V S N K A L P A P I E K T I S K A K G Q P R E P Q V Y T L P P S R D E L T K N Q V S L T C L V K G F Y P S D I A V E W E S N G Q P E N N Y K T T P P V L D S D G S F F L Y S K L T V D K S R W Q Q G N V F S C S V M H E A L H N H Y T Q K S L S L S P G 16 anti-TNF Ig- Vvltpykpepgyecqisqeyydrkaqmccakcppgqyvkhfcnktsdtvcadceasmytqvwnqf fusion rtclscssscttdqveiractkqqnrvcaceagrycalkthsgscrqcmrlskcgpgfgvassra protein pngnylckacapgtfsdttsstdvcrphricsilaipgnastdavcapesptlsaiprtlyvsqp eptrsqpldgepgpsqtpsiltslgstpiieqstkgggsvprdcgckpcictvpevssvfifppk pkdvltitltpkvtcvvvdiskddpevqfswfvddvevhtaqtkpreeqfnstfrsyselpimhq dwlngkefkcrynsaafpapiektisktkgrpkapqvytipppkeqmakdkvsltcmitdffped itvewqwngqpaenykntqpimdtdgsyfyysklnvqksnweagntftcsvlheglhnhhteksl shspgk 17 Extracellular M R F P S I F T A V L F A A S S A L A A P V domain of N T T T E D E T A Q I P A E A V I G Y S D L FcγRIIb/c and E G D F D V A V L P F S N S T N N G L L F I histidine tag N T T I A S I A A K E E G V S L E K R A P P K A V L K L E P Q W I N V L Q E D S V T L T C R G T H S P E S D S I Q W F H N G N L I P T H T Q P S Y R F K A N N N D S G E Y T C Q T G Q T S L S D P V H L T V L S E W L V L Q T P H L E F Q E G E T I V L R C H S W K D K P L V K V T F F Q N G K S K K F S R S D P N F S I P Q A N H S H S G D Y H C T G N I G Y T L Y S S K P V T I T V Q A P G G G H H H H H H H H H 18 Fc region T C P P C P A P E L L G G P S V F L F P P K P K D T L M I S R T P E V T C V V V D V S H E D P E V K F N W Y V D G V E V H N A K T K P R E E Q Y N S T Y R V V S V L T V L H Q D W L N G K E Y K C K V S N K A L P A P I E K T I S K A K G Q P R E P Q V Y T L P P S R D E L T K N Q V S L T C L V K G F Y P S D I A V E W E S N G Q P E N N Y K T T P P V L D S D G S F F L Y S K L T V D K S R W Q Q G N V F S C S V M H E A L H N H Y T Q K S L S L S P G 19 Fc region E P K S C D K T H T C P P C P A P E L L G G P S V F L F P P K P K D T L M I S R T P E V T C V V V D V S H E D P E V K F N W Y V D G V E V H N A K T K P R E E Q Y N S T Y R V V S V L T V L H Q D W L N G K E Y K C K V S N K A L P A P I E K T I S K A K G Q P R E P Q V Y T L P P S R D E L T K N Q V S L T C L V K G F Y P S D I A V E W E S N G Q P E N N Y K T T P P V L D S D G S F F L Y S K L T V D K S R W Q Q G N V F S C S V M H E A L H N H Y T Q K S L S L S P G

While the present invention is described herein with reference to illustrated embodiments, it should be understood that the invention is not limited hereto. Those having ordinary skill in the art and access to the teachings herein will recognize additional modifications and embodiments within the scope thereof. 

1. A method for producing a recombinant antibody in a host cell comprising: a. providing a genetically modified cell that has been genetically engineered to produce an antibody having sialylated N-glycans, wherein the host cell comprises a nucleic acid encoding the heavy chain of the antibody, and wherein the nucleic acid encodes mutations at amino acid positions 243 and 264 of the heavy chain, wherein the mutations at positions 243 are selected from the group consisting of: F243A, F243G, F243S, F243T, F243V, F243L, and F243I and the mutations at position 264 are selected from the group consisting of: V264A, V264G, V264S and V264T; b. culturing the transformed host cell under conditions which induce expression of the antibody; and c. isolating the antibody from the transformed host cell to produce the recombinant antibody having sialylated N-glycans.
 2. The method of claim 1, wherein the nucleic acid encodes the mutations F243A and V264A.
 3. The method of claim 1, wherein the host cell is a yeast host cell.
 4. The method of claim 3, where the yeast host cell is Pichia pastoris.
 5. The method of claim 1, wherein the isolated antibody has an N-glycan composition in which the amount and percentage of total sialylated N-glycans is increased relative to a wild type antibody produced in the host cell.
 6. The method of claim 1, wherein at least 40 mole % of the N-glycans on the antibodies are sialylated.
 7. The method of claim 1, wherein at least 47 mole % of the N-glycans on the antibodies have the structure NANA₍₁₋₄₎Gal₍₁₋₄₎GlcNAc₍₂₋₄₎Man₃GlcNAc₂.
 8. The method of claim 1, wherein at least 47 mole % of the N-glycans on the antibodies have the structure NANA₂Gal₂GlcNAc₂Man₃GlcNAc₂.
 9. The method of claim 1, wherein the sialic acid residues in the sialylated N-glycans are attached via an α-2,6 linkage.
 10. The method of claim 8, wherein the sialylated N-glycans comprise no detectable level of an α-2,3 linked sialic acid. 11.-50. (canceled) 